Table Of Contents
Release Notes for Cisco ACNS Software, Release 5.3.7
New Features in the ACNS 5.3.7 Software
New Rule Pattern to Filter Content Based on the X-forwarded-for IP Address
New CLI Commands and GUI Support for Managing Outgoing Proxy Monitoring
Eliminated Upgrade/Downgrade Paths
Media File System Issues When Downgrading to ACNS 5.0 Software
SmartFilter Issues When Upgrading or Downgrading to Another ACNS Software Release
Websense Issues When Downgrading to the ACNS 5.0 Software or ACNS 5.1 Software
Interoperability with ICAP Vendors
Matrix of Supported Caching, Filtering, and Authentication Methods
Open Caveats—ACNS 5.3.7 Software
Resolved Caveats—ACNS 5.3.7 Software
Acquisition and Distribution Resolved Caveats
Media and Streaming Resolved Caveats
Proxy and Caching Resolved Caveats
Software Upgrade and Downgrade Resolved Caveats
WAE Platform Support in the ACNS 5.3.3 Software and Later Release
Enhancements to the Envivio-Cisco Streaming Engine Interoperability
Retention of m4e File Extensions for Envivio-Based Programs
Support of Dynamic Content Routing Added in the ACNS 5.3.3 Software and Later Releases
Content Distribution Manager GUI-Related Changes in the ACNS 5.3.3 Software Release
Restoring Factory-Default Settings for Real Networks License Keys
Ability to Configure TCP Memory Limits
CLI-Related Changes in the ACNS 5.3.3 Software and Later Releases
Rule Command for Converting Hostnames to IP Addresses Was Added in the ACNS 5.3.3 Software Release
Output of the show programs EXEC Command Was Modified in the ACNS 5.3.3 Software Release
Cisco Product Security Overview
Reporting Security Problems in Cisco Products
Obtaining Technical Assistance
Cisco Technical Support & Documentation Website
Definitions of Service Request Severity
Obtaining Additional Publications and Information
Release Notes for Cisco ACNS Software, Release 5.3.7
April 26, 2006
ACNS Build 5.3.7-b8
Note
The most current Cisco documentation for released products is available at Cisco.com at http://www.cisco.com. The online documents may contain updates and modifications made after the hardcopy documents were printed.
Contents
These release notes contain information about the Cisco Application and Content Networking System (ACNS) 5.3.7 software. These release notes describe the following topics:
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Introduction
The ACNS software combines the technologies of demand-pull caching and pre-positioning for accelerated delivery of web applications, objects, files, and streaming media; the ACNS software runs on Cisco Content Engines, Content Distribution Manager, and Content Router hardware platforms.
These release notes are intended for administrators who will be configuring, monitoring, and managing devices that are running the ACNS 5.3.7 software. These release notes describe the new product features, the supported hardware, and the open and resolved caveats regarding the ACNS 5.3.7 software release.
New and Changed Information
This section describes new and changed features in the ACNS 5.3.7 software release. It also lists the supported hardware.
New Features in the ACNS 5.3.7 Software
The ACNS 5.3.7 software introduces the following new features and enhancements:
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Enhancements to ICAP Support
The Internet Content Adaptation Protocol (ICAP) is an open standards protocol for content adaptation, typically at the network edge. The ACNS 5.3.7 software supports the following enhancements for ICAP support:
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ICAP Request Modification Support for HTTPS Requests
The ACNS 5.3.7 software supports an ICAP request modification (reqmod) for the HTTPS proxy-style requests. Support for ICAP reqmod processing allows proxy-style requests that use HTTPS protocol to be modified as they are sent from the Content Engine to the ICAP server on their way to the origin server. For more information on ICAP support, see the "Interoperability with ICAP Vendors" section.
Compatibility with the Data Trickling of WebWasher ICAP Server
The ACNS 5.3.7 software allows you to download large files over an ICAP-enabled network. Because of some compatibility issues with the data trickling feature of the WebWasher ICAP server, downloading large files over ICAP-enabled ACNS networks used to fail before the download was completed. However, starting with release 5.3.7, the ACNS software has become compatible with the data trickling feature of the WebWasher ICAP server.
Support for Accessing Blank Pages over ICAP-Enabled Networks
The ACNS 5.3.7 software allows you to access blank pages (null body pages, where there is no content) over an ICAP-enabled ACNS network. When you try to access blank pages, earlier versions of the ACNS software used to return error messages saying that the page could not be retrieved because the server was either unreachable or temporarily busy.
New CLI Command and GUI support for Configuring ICAP Connection Timeout
The ACNS 5.3.7 software allows you to configure a timeout value for ICAP connections. You can configure an ICAP connection timeout value using the following CLI command:
CE(config)#icap connection-timeout minutesYou can enter a number between 1 and 480 as the ICAP connection timeout interval in minutes to allow a longer timeout interval when you want to download large files from ICAP-protected sites.
Alternatively, you can configure the ICAP connection timeout from the Content Distribution Manager GUI.
To configure the ICAP connection timeout from the Content Distribution Manager GUI, follow these steps:
Step 1
Step 2
Step 3
Step 4
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New Rule Pattern to Filter Content Based on the X-forwarded-for IP Address
The ACNS 5.3.7 software allows you to use a new rule pattern to filter content based on the x-forwarded-for IP address in the HTTP header. The x-forwarded-for attribute contains the IP address of the device from where the request originated. Only the use-server rule action is supported for the x-forwarded-for rule pattern. The use-server action sends server-style HTTP requests from the Content Engine to the specified IP address and port on a cache miss.
You can configure the x-forwarded-for rule pattern using the following CLI command:
CE(config)#rule pattern-list 1 header-field x-forwarded-for ip-addressAlternatively, you can configure the x-forwarded-for rule pattern from the Content Distribution Manager GUI.
To configure the rule-pattern from the Content Distribution Manager GUI, follow these steps:
Step 1
Step 2
Step 3
Step 4
Step 5
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Step 6
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Step 7
For more information on creating rule patterns and configuring rule actions, see Chapter 16, "Configuring Request Processing Services" in the Cisco ACNS Software Configuration Guide for Centrally Managed Deployments, Release 5.3.
New CLI Commands and GUI Support for Managing Outgoing Proxy Monitoring
The Cisco ACNS 5.3.7 software allows you to enable and disable the monitoring of an outgoing proxy for HTTP, HTTPS, and FTP-over-HTTP services. Typically, in an ACNS network, the outgoing proxy is monitored at regular user-configured intervals and is marked dead if there is no response from the proxy in the given interval. When you have only one outgoing proxy configured on your device, you can disable the proxy monitoring because there is no alternative to route the traffic even when the outgoing proxy is marked dead. Similarly, when you have multiple outgoing proxies but do not want to use proxies other than the primary proxy, you can disable the monitoring and ensure that all requests are sent to the primary proxy, that is, the first outgoing proxy configured on that device.
The Cisco ACNS 5.3.7 software introduces the following global configuration commands for enabling and disabling the monitoring of outgoing proxy for HTTP, HTTPS, and FTP-over-HTTP services:
CE(config)# http proxy outgoing monitor enableCE(config)# no http proxy outgoing monitor enableCE(config)# https proxy outgoing monitor enableCE(config)# no https proxy outgoing monitor enableCE(config)# ftp-over-http proxy outgoing monitor enableCE(config)# no ftp-over-http proxy outgoing monitor enableBecause monitoring of the outgoing proxy is enabled by default, only the no form of these commands is displayed in the show running config file. When you disable the monitoring, the show {http | https | ftp-over-http} proxy command does not show any proxy as dead; instead, the command displays only the IP address and port number for the proxies.
In the Cisco ACNS 5.3.7 software, you can also enable or disable the monitoring of outgoing proxies from the Content Distribution Manager GUI.
To enable or disable the monitoring of outgoing proxies from the Content Distribution Manager GUI, follow these steps:
Step 1
Step 2
Step 3
Step 4
Step 5
Hardware Supported
The ACNS 5.3.7 software supports the following hardware platforms.
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Important Notes
This section emphasizes important information regarding the ACNS 5.3.x software. It includes the following sections:
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Eliminated Upgrade/Downgrade Paths
In the ACNS 5.3.x software release, the following upgrade and downgrade paths were eliminated:
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Media File System Issues When Downgrading to ACNS 5.0 Software
If you have configured the media file system (mediafs) with the ACNS 5.1 software and later releases, and then downgrade to the ACNS 5.0 software, the mediafs disk space assignment is lost and reverts to the ACNS network file system (cdnfs) disk space. (The mediafs is used for on-demand content that is fetched through the two streaming protocols [RTSP and WMT]. The cdnfs is used for pre-positioned content in the ACNS network.)
This situation occurs because of a design change that was implemented in the ACNS 5.1 software. Because the ACNS 5.0 software is not compatible with this change, the disk space becomes assigned to cdnfs instead of mediafs. To work around this problem, follow these steps:
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Use the Content Distribution Manager GUI for Content Engines that are registered with a Content Distribution Manager. Use the Content Engine GUI for standalone Content Engines (Content Engines that are not registered with a Content Distribution Manager and are being managed through the Content Engine GUI or CLI).
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SmartFilter Issues When Upgrading or Downgrading to Another ACNS Software Release
When you upgrade or downgrade the Content Engine to a different release of the ACNS software, if there is a difference in the SmartFilter plug-in version, the SmartFilter database and configuration files are deleted and default configurations are loaded. This change occurs because the configuration details might be changed with each new version of SmartFilter software. After each upgrade or downgrade of the SmartFilter plug-in, a fresh database has to be downloaded from the SmartFilter Administration Console to the Content Engine.
Websense Support
In the ACNS 5.3.x software, Websense server Version 5.2 is supported on all Cisco Content Engine platforms. With Websense 5.2.0 software, you can use a local or remote Websense Policy Server to activate the local EIM Server, the local RADIUS Agent, the local eDirectory Agent, the local Network Agent, and the local User Service individually on a Content Engine.
For detailed information about configuring the Websense software, go to the following URL on the Websense website:
http://ww2.websense.com/docs/support/documentation/setup/v52/WSPreinstall_CiscoCE_ACNS_53.pdf
Websense Issues When Downgrading to the ACNS 5.0 Software or ACNS 5.1 Software
If the local (internal) Websense server is enabled on the Content Engine and you downgrade from the ACNS 5.2.x software to either ACNS 5.0 software or ACNS 5.1 software, the WebsenseEnterprise directory is removed from the Content Engine and the local Websense server stops working. The ACNS 5.2.x software does not generate an error message indicating that the WebsenseEnterprise directory has been removed. However, in the ACNS 5.3.1 software and later releases, the following error message is displayed to notify you about this Websense downgrade issue:
WARNING:Websense does not support downgradeHence removing /local/local1/WebsenseEnterpriseWebsense will stop working after copy ftp installTo avoid this problem when downgrading from the ACNS 5.3.x or ACNS 5.2.x software to either ACNS 5.1.x software or ACNS 5.0.x software, follow these steps:
Step 1
Step 2
Step 3
Interoperability with ICAP Vendors
The Internet Content Adaptation Protocol (ICAP) is an open standards protocol for content adaptation, typically at the network edge. Content adaptation includes virus scanning, content translation, content filtering, content insertion, and other ways of improving the value of content to end users. ICAP specifies how a Content Engine, acting as an HTTP proxy server, can communicate with an external device that is acting as an ICAP server, which filters and adapts the requested content.
ICAP provides two content-processing modes for HTTP services and one for HTTPS proxy-style requests. These modes define the transactions that can occur between a Content Engine acting as an ICAP client and an ICAP server. The two modes are as follows:
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The following is a complete list of the ICAP vendors that have been certified to interoperate with the Content Engine:
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ICAP Performance
With the respmod vectoring point, which is used by virus-scanning Internet Content Adaptation Protocol (ICAP) vendors, the performance of the Content Engine model CE-7305 will be 300 transactions per second.
With the reqmod-precache vectoring point, which is used by URL filtering ICAP vendors, the performance of the Content Engine model CE-7305 will drop 20 percent from the rated performance.
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Matrix of Supported Caching, Filtering, and Authentication Methods
Table 1 lists the caching, filtering, and authentication methods supported by Content Engines that are running the ACNS 5.3.x software. An asterisk (*) indicates a feature is supported for that particular protocol.
Caveats
This section lists and describes the open and resolved Severity 1, 2, and 3 caveats in the ACNS 5.3.7 software. Caveats describe unexpected behavior in the ACNS 5.3.7 software. Severity 1 caveats are the most serious; Severity 2 caveats are less serious. Severity 3 caveats are moderate caveats.
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Open Caveats—ACNS 5.3.7 Software
This section lists caveats that have not been resolved in the ACNS 5.3.7 software release.
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Symptom: Content cannot be acquired using strong authentication from secure origin servers that use certificates from nonstandard certificate authorities (CAs). If strong authentication was chosen for content acquisitions from such a site, the acquirer error statistics will contain a 401 (Unauthorized) error code, and the acquirer error log contains the following error message:
Strong Cert Authentication rejects certificate due to error: ssl error codeCondition: This problem occurs if the origin server uses a certificate that is not known as a standard certificate to the ACNS software acquirer. For content acquisition from secure sites over HTTPS using strong authentication, only sites with certificates from standard certificate authorities are supported.
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Workaround: Use one of these workarounds:
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Symptom: When a Content Engine model CE-565 is attached to a Storage Array SA-7 device, if too large a cache file system (cfs) partition is configured, and a combined streaming and caching workload is used, then a lower HTTP performance is observed.
Condition: This problem occurs when the CE-565 has Windows Media Technologies (WMT) enabled, a combined streaming and caching workload is used, and the Content Engine is attached to an SA-7 device.
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Workaround: Allocate less space to the cfs if a Storage Array is attached to the Content Engine.
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Symptom: Windows Media Technologies (WMT) is enabled with no media file system (mediafs) after you downgrade from the ACNS 5.1b300 software to the ACNS 5.0.7b8 software.
Condition: This problem occurs if you upgrade from the ACNS 5.0.7b8 to the ACNS 5.1bx software, configure the disk, and then downgrade to the ACNS 5.0.7b4 software.
Workaround: Reconfigure the disk with a mediafs partition and reload the software.
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Symptom: Using FTP inside the .meta file to have the Content Engine obtain the .bin file for a Content Distribution Manager GUI-initiated upgrade is unsuccessful if the user's home directory differs from the FTP root.
Condition: Either you receive an error in the Content Distribution Manager GUI when you are creating the definition for the upgrade (when the .bin file does not exist in the user's home directory), or the Content Engine displays an error message on the upgrade (when the .bin file does not exist in the FTP root directory).
Workaround: Copy the .bin file to both the FTP root and the user's home directory, or use a user whose home directory is the FTP root.
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Symptom: The Content Distribution Manager only checks if coverage zone files refer to invalid Content Engines after there is a fresh import. When there is a configuration change that can cause already imported coverage zone files to refer to invalid Content Engines, the Content Distribution Manager does not check or display the correct error message until the next fresh import.
Condition: This problem occurs if there is a coverage zone configuration change that causes already-imported coverage zone files to refer to invalid Content Engines.
Workaround: There is no known workaround.
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Symptom: The Content Engine stops spoofing the client IP address and uses its own IP address to fetch content from the origin server.
Condition: The http l4-switch spoof-client-ip enable global configuration command turns on IP spoofing on a Content Engine that is functioning as a caching engine. When a rule action use-server global configuration command is used, the Content Engine stops spoofing the client IP address and instead uses its own IP address to fetch the content.
Workaround: Remove the rule configurations.
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Symptom: The network management system (NMS) host does not know where SNMP traps are coming from.
Condition: This problem occurs if there are two interfaces and you configure interface redundancy using both interfaces. You must use a dummy address for the physical addresses. You then configure a real address that floats between the two interfaces. If you then configure SNMP traps, the traps are being sourced from the dummy address and not the routable address. Therefore, the NMS host does not know where the trap is coming from.
Workaround: Configure the Content Engine to generate SNMP version 2c type trap messages. Because the SNMP version 2c trap message does not contain the IP address of the SNMP agent, the NMS software will use the source IP address of the UDP message to identify the address of the SNMP agent.
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Symptom: The cdnfs files are turned into directories (which are visible if you enter the cdnfs browse EXEC command on the Content Engine).
Condition: This problem is rare and occurs only when the file system corruption has caused a directory entry to be a subdirectory when it should have been a file. This problem occurs only if multiple cdnfs entries are being updated and the Content Engine crashes (for example, the Content Engine crashes because of a power failure).
Workaround: Enter the cdnfs cleanup start EXEC command on the Content Engine.
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Symptom: Even though you entered the url-filter wmt bad-sites-deny global configuration command on the Content Engine, the Content Engine is not filtering requests for content that is pre-positioned in its wmt_vod directory.
Condition: This problem occurs in the following situation:
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Workaround: Configure the bad site list using mmst://127.0.0.1/wmt_vod/file.asf instead of mmst://Content Engine IP address/wmt_vod/file.asf.
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Symptom: A WMT live stream in a managed live event environment is accessible for a period longer than the scheduled duration.
Condition: This problem occurs only with WMT live programs that have unicast access enabled. In this situation, streams can be accessible for up to 24 hours after the last playtime of the event if "Auto Delete" is set to true or can be accessible indefinitely if "Auto Delete" is set to false.
Workaround: Control the live-stream source through the schedule for the event. Typically, this process involves starting and stopping the WMT encoder.
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Symptom: Syslog messages contain the following text:
uns-server: %CE-CDNFS-0-480000: uns_read_meta: WOW! url mismatch:wanted 'URL>', swaw '^C'Condition: This problem occurs because of file system corruption; the cdnfs metadata files have the wrong content (the content is internally consistent but is in the incorrect file). This problem occurs infrequently. For example, it can occur if the cdnfs content is being updated and a crash occurred because of a kernel panic (which occurs infrequently).
Workaround: Although there is no known workaround to stop the syslog messages shown above, lookups for the target URL (listed in the syslog message) may succeed if the ACNS software has created a new cdnfs entry for the target URL.
You can enter the cdnfs lookup url EXEC command to see if the URL is found. If the URL is not found, a way to force it to be replicated is to modify the file on the origin server (for example, by entering the touch command on a UNIX-based origin server).
Alternatively, you can enter the acquisition-distribution database-cleanup start command on the affected Content Engine to query the cdnfs for all the objects that are supposed to be on the Content Engine. Missing objects should be detected and replicated.
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Symptom: The content replication status can show an incorrect manifest item count.
Condition: This problem can occur if too many channels share the same content (for example, if over 100 channels share the same 30 files in each channel). Even though all 100 channels should show the 30 files that were acquired and distributed, it takes an extended period (days) before the correct manifest item count is displayed.
Workaround: Reduce the number of channels that share the same contents.
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Symptom: The CPU usage on the Content Engine hits a peak of 100 percent.
Condition: This problem can occur if the internal (local) Websense server is enabled on the NM-CE-BP models.
Workaround: There is no known workaround.
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Symptom: If you specify foo as a folder URL in the manifest file, and there is a single item redirection from foo to foo/ by the web server, the ACNS acquirer fails to process such redirections and generates a 716 error message. If you are using the quick crawl tool in the Channel Content window, some of the files also report 716 error messages.
Condition: This problem occurs if you are using the quick crawl tool and there is a single item redirect from foo to foo/. However, if foo is a link from a crawl job, single item redirections from foo to foo/ are allowed.
Workaround: Specify foo/ in the manifest file, or specify a crawl job instead of using the quick crawl tool.
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Symptom: Microsoft NT LAN Manager (NTLM) authentication fails and the pop-up window is displayed again.
Condition: This problem occurs if NTLM authentication is being used and the specified domain name is longer than 50 characters.
Workaround: For NTLM authentication, use a domain controller (DC) that has a domain name shorter than 35 characters.
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Symptom: Proxy requests to the Content Engine proceed to allow mode (if allow mode is enabled) or are blocked (if allow mode is disabled) when the Websense URL filtering mechanism is configured to use the local Websense server.
Because the connections from the Content Engine to the Websense server time out, all requests go to allow mode until all 40 connections are exhausted. (This situation makes it appear as if the Websense server is not responding.) After all 40 connections are attempted, the Content Engine successfully connects to the Websense server and works properly thereafter.
Condition: This problem can occur under the following conditions:
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Workaround: Reconfigure Websense URL filtering on the Content Engine so that the Content Engine will attempt to establish new connections to the Websense server.
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Symptom: Channel routing causes loops for several Content Engines.
Condition: This problem can occur if there are Content Engines that are running the ACNS 5.1.x software or earlier, and these Content Engines are registered with a Content Distribution Manager that is running the ACNS 5.2.x software.
Workaround: Upgrade the Content Engines to the ACNS 5.2.x software. Currently, a Content Distribution Manager that is running the ACNS 5.2.x software does not propagate some configuration changes to Content Engines that are running an ACNS software release earlier than the ACNS 5.2.x software. Therefore, Content Engines that are running the ACNS 5.1.x software or earlier, may not recognize that the root Content Engine was changed from one Content Engine to another. Consequently, routing loops can develop within the system.
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Symptom: When a root Content Engine is downgraded from the ACNS 5.2.x software to the ACNS 5.1 software, some channels are disabled and some content fails to be acquired.
Condition: This problem occurs when the manifest file URL is a Server Message Block (SMB) URL with a uniform naming convention (UNC) path format (for example, \\host\share\file), or when an item or crawl task specified in either the src or start-url attribute has a UNC path format.
Because the ACNS 5.1 software does not support SMB file acquisition, the root Content Engine running the ACNS 5.1 software is not able to fetch the manifest file or acquire content from the SMB shares.
Workaround: Either before or after you downgrade the root Content Engine from the ACNS 5.2.x software to the ACNS 5.1 software, remove the SMB URL from the Manifest URL field in the Channel configuration window of the Content Distribution Manager GUI and use a URL with supported protocols (HTTP, FTP, or HTTPS).
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From an ACNS 5.2.x Content Distribution Manager GUI, choose Content > Channels > Edit Channel > Channel Content.Edit the manifest file by removing content items and crawl tasks that have UNC formatted paths.
Use the acquirer start-channel EXEC command to initiate channel acquisition and verify that the workaround is successful.
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Symptom: The CMS service on the Content Distribution Manager cannot start and fails to create the CMS database backup file.
Condition: This problem can occur if the ACNS network configuration is very large (for example, with 2000 configured Content Engines) and the sysfs partition is 2 GB or less.
Workaround: Create a sysfs partition that is greater than 2 GB.
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Symptom: Microsoft NT LAN Manager (NTLM) authentication occurs even though you disabled it on the Content Engine.
Condition: This problem occurs very rarely. In very rare situations, even though you entered the no ntlm server enable global configuration command to disable NTLM proxy authentication on the Content Engine, NTLM proxy authentication is still not turned off. In such cases, NTLM authentication can still occur, although the output of the show running EXEC command shows that the NTLM server is not enabled on the Content Engine.
Workaround: Enter the no ntlm server enable global configuration command again on the Content Engine.
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Symptom: The ICAP service is enabled on the Content Engine, but the Content Engine is unable to retrieve the content.
Condition: This problem can occur if the Content Engine is running the ACNS 5.x software, and you configure two or more ICAP services to subscribe to the same vectoring point (the response modification [RESPMOD] vectoring point).
Workaround: There is no known workaround.
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Symptom: A cleanup of the sysfs partition removes all pre-positioned RealMedia contents from the /local1/real_vod/ directory on the Content Engine.
Condition: This problem occurs if the sysfs partition is saturated because of the population of content in the real_vod directory.
Workaround: There is no known workaround.
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Symptom: The WCCP cache farm (a cluster of Content Engines that are running WCCP) is formed using the assignment method even though you specified the mask-assignment assign-method- strict option when configuring the WCCP service.
Condition: This problem occurs if the WCCP cache farm is associated with Cisco routers instead of switches.
Workaround: There is no known workaround. Mask assignment was only designed for Catalyst 6500 series switches and is not supported by Cisco routers.
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Symptom: The stream scheduler in the edge Content Engine retrieves stale Session Description Protocol (SDP) information from its forwarder and stores it in its local1/cse_live/ucast folder if the encoding is modified through IP/TV Program Manager. All further RTSP requests are served with this stale SDP content.
Condition: This problem occurs if the stream scheduler retrieves stale SDP information from its forwarder because the program has been edited and the encoding changed for a program. This situation occurs if the Content Distribution Manager notification at the edge Content Engine triggers the stream scheduler before the same occurs at the root Content Engine. Consequently, the edge Content Engine obtains the SDP content from its forwarder, which is valid content at that moment.
Workaround: Reload the Content Engine.
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The Content Engine becomes unresponsive, and it takes a long time for commands to be executed.
Condition: This problem occurs when the load that is running on the Content Engine is almost as high as the maximum permissible load for a Content Engine, and you then enable ICAP (especially with request modification [REQMOD] transactions). This situation causes the Content Engine to go into an overload state and not recover easily.
Workaround: The load on the Content Engine with ICAP enabled (for the response modification [respmod] transactions) should be kept to 50 percent of the load that it can handle without ICAP.
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Symptom: A URL in the Synchronized Multimedia Integration Language (SMIL) file that has the "repeatCount" value set, may not be requested as many times as specified by the "repeatCount" setting.
Condition: This problem occurs only when RealPlayer Version 10 is used. The player exhibits the same behavior whether or not there is a Content Engine between the client and the origin server.
Workaround: Use RealOne player instead of RealPlayer Version 10, or request the SMIL file again. The URL will be played at least once in the player.
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Symptom: An HTTP 1.0 request that is received by the Content Engine from a client web browser is sent as an HTTP 1.1 request by the Content Engine to the origin server.
Condition: This problem occurs only when the ICAP service is enabled on the Content Engine.
Workaround: There is no known workaround.
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Symptom: The cache process on the Content Engine restarts.
Condition: This problem occurs if a large volume of HTTPS and FTP traffic is being directed to the Content Engine, which is operating in transparent mode.
Workaround: There is no known workaround.
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Symptom: Even though you entered a write memory command, after an immediate reload, a prompt appears that the configuration has been changed.
Conditions: This problem occurs if the following conditions are met:
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Workaround: Note that ACNS functionality is not affected if this problem occurs. However, if a prompt appears stating that the configuration has been changed, enter yes to save the configuration.
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Symptom: Unicast access to a live program does not work.
Condition: This problem occurs only when you use special characters ("?" and "#") in the unicast reference URL.
Workaround: To publish a live event, use URLs that do not contain special characters.
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Symptom: The Content Engine reboots suddenly when you are performing database maintenance.
Condition: The problem can occur because of a platform issue in the power supply of the device.
Workaround: Properly trim the power supply of the Content Engine.
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Symptom: You are not able to download the control list or apply a policy (for example, the policies that control when the SmartFilter subscription or control list expire) to the SmartFilter 3.x plug-in.
Condition: This problem occurs if you use the SmartFilter 4.0 Administrator Console to define the SmartFilter 3.x plug-ins as part of a plug-in group.
Workaround: Use the SmartFilter 4.0 Administrator Console to define the SmartFilter 3.x plug-ins as individual plug-ins.
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Symptom: The proxy autoconfiguration file is missing from the Content Engine after you switch from group settings to device settings, and then switch back to group settings.
Condition: This problem can occur in the following condition:
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b.
c.
The autoconfiguration file is not found but the proxy autoconfiguration feature is shown as enabled.
Workaround: Return to the device window in the Content Distribution Manager GUI, delete the values from the proxy autoconfiguration fields in the device window, and then select device group from the drop-down menu.
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Symptom: When using the quick start tool in the Content Distribution Manager GUI, if you repeatedly click the Add-Router to List button before the window completely loads in your browser, the following message appears in your browser:
The system had trouble processing your last request.This situation can occur under the following circumstances:
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Condition: This problem occurs only when there is a slow connection between the Content Distribution Manager and your browser and you perform any of the unsupported actions described above.
Workaround: Return to the Content Distribution Manager GUI and wait until the window is completely loaded in your browser before you click the Add-Router to List button.
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Symptom: HTTP VoD file statistics are not being updated correctly.
Condition: This problem can occur if you enter the show statistics wmt requests EXEC command while you are using the HTTP protocol to play a stream. The command output shows the total unicast requests field as 2 but shows the other types of requests (for example, the number of served streaming requests) as only 1.
Workaround: Wait until the stream ends before you enter the show statistics wmt requests EXEC command.
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Symptom: The Websense EIM server that is running on the Content Engine generates a core file.
Condition: This problem can occur when the Websense server is enabled on the Content Engine.
Workaround: No user intervention is required. If this problem occurs, the Websense server functionality is not affected. After generating a core file, the Websense server will be automatically restarted and the functionality is restored.
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Symptom: If you modify a Content Engine GUI page and reload the page without first clicking the Update button, the new (unsaved) values are displayed on the page instead of the old (saved) values.
Condition: This problem only occurs if you are using the latest versions of the Netscape browser (Version 7.0 or later) to access the Content Engine GUI.
Workaround: Go to another Content Engine GUI page, and then return to the same Content Engine GUI page instead of reloading the page. The redisplayed Content Engine GUI page will display the old (saved) values instead of the new (unsaved) values.
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Symptom: When WCCP transparent redirection is being used to redirect RTSP client requests transparently to WCCP routers, the client receives an error stating that it is unable to locate the server when it attempts to retrieve the RTSP URL. This problem can occur because the URL presented to the client is a modified "bad" URL. This modified URL is the original URL with the Content Engine's RTSP gateway IP address prepended before the domain name. For example, if the original RTSP URL is "rtsp://website.com.domain:554/url-path-info," then the following modified "bad" URL is returned to the client:
rtsp://ciscoRTSPG.ipaddress-of-rtsp-gateway.website.com.domain:554/url-path-info
The reason that the client is unable to resolve the DNS is because the Content Engine is using the modified URL.
Condition: The problem can occur when the WCCP router list (wccp router-list x.x.x.x CLI command) on the Content Engine is configured with a router IP address that the router does not use in its WCCP "I See You" messages.
Workaround: Configure the WCCP router list to use the IP address that the WCCP router is using on its "I See You" messages.
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Symptom: RealPlayer crashes when the streams are switched over from the first stream to the second stream.
Condition: This problem can occur if you have set the reconnect as automatic for broadcast redundancy.
Workaround: Set the reconnect as manual instead as automatic.
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Symptom: CPU usage on the Content Engine reaches 99 percent.
Condition: This high CPU usage can occur if the Content Engine is serving numerous live-streaming requests and it is running the ACNS 5.1.11 software and later releases.
Workaround: If you are not expecting a very high load on the Content Engine, you can turn off kernel optimization by entering the no wmt accelerate live-split enable global configuration command.
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Symptom: The local (internal) Websense server on the Content Engine is not responding to a block page message.
Condition: This problem can occur if certain clients do not behave properly and fail to send the requested data back to the Websense block page server. The block page server is not timing out these requests, reaches a limit, and then stops responding.
Workaround: Restart the internal Websense server or reboot the Content Engine to clear the connections.
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Symptom: SNMP management is not able to learn the standby interface in order to test the standby interface for accessibility.
Condition: This problem can occur if the Content Engine is configured with a standby interface and the SNMP management station uses an MIB query for ipAdEntAddr. The SNMP management system learns the addresses of the individual interfaces but not the address of the standby group.
Workaround: Configure real addresses for the interfaces on the Content Engine so that the SNMP management station can at least test that the interfaces on the Content Engine are active.
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Symptom: After you configure a live event through the ACNS 5.2 Content Distribution Manager GUI, the URL link generated by the Content Distribution Manager cannot be played.
Condition: This problem only occurs if the media filename or program name includes a blank space.
Workaround: Do not use a blank space in either the media filename or the program name when using the Content Distribution Manager to configure a live event. For example, use "-" or "_" instead of a blank space.
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Symptom: Internet Explorer does not display the RealServer License Monitor window correctly. (This window is displayed by logging in to the RealServer administrative interface and then selecting Logging & Monitoring and License Monitor.)
Condition: This problem only occurs with Internet Explorer.
Workaround: Use the Firefox or Netscape browsers, which display the License Monitor window correctly.
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Symptom: Both Internet Explorer and Firefox browsers do not correctly display changed settings for the broadcast transmitter and receivers.
Condition: This problem occurs if the Content Engine is running the ACNS 5.2.x software and later releases, and is using RealServer as a back-end RTSP server.
Workaround: There is no known workaround.
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Symptom: The Internet Explorer client retrieves a partial (incomplete) customized error page and displays it along with some partial HTML code.
Condition: This problem occurs if a customized error page is configured on the Content Engine and an Internet Explorer client requests a nonexistent HTTPS URL, which causes the customized error page to be returned.
Workaround: There is no known workaround.
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Symptom: NTLM authentication for a valid user may take a longer period than usual (approximately two minutes) if the client sends the request when the Content Engine has been idle for a long period of time.
Condition: This problem can occur in the following condition:
a.
b.
c.
GET http://somehostname/Zone-UVWXYZ/config.cfg HTTP/1.0\r\nRequest Method: GETAccept: */*\r\nUser-Agent: Tioga\r\nHost: somehostname\r\nPragma: no-cache\r\nwhere somehostname is a hostname.
The user will be authenticated after waiting approximately two minutes. After reporting a failure to the browser, the Content Engine uses the same credential and retrieves the group information for that user from its HTTP authentication cache.
Workaround: On the Content Engine, configure a rule to either reject requests from the user agent named Tioga, or configure the no-auth rule to bypass authentication for this user agent.
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Symptom: In a Content Router environment, users are not able to choose RTSPU (UDP) or RTPST(TCP) by requesting with rtspu:// or rtspt:// from their Windows Media players. Another symptom is that an RTSPT stream is returned when an RTSPU stream is requested. A third symptom is that even though you specified the wmt disallowed-client-protocols rtspu global configuration command, it is not preventing clients from being served for a request rtspu://crfqdn/file.asf, which will return an RTSP stream instead of an error.
Condition: This problem can occur if a Content Router is being used for RTSP redirection.
Workaround: There is no known workaround.
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Symptom: When viewing a rich media stream, the video display may be black for a couple of minutes. After the video starts to play, if you click the progress bar in the Windows Media player to advance the video, the video display may go black again as though the video were starting over again.
Condition: This problem can occur if you are using a Windows Media 9 client to view a rich media stream.
Workaround: There is no known workaround.
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Symptom: Even though you have the transaction log sanitize feature enabled on the Content Engine, the RealProxy or RealServer access logs still display the client IP address even though it should be hidden.
Condition: This problem is caused because the transaction-logs sanitize CLI command is not working properly for the RealProxy and RealServer. Even though you have entered the transaction-logs sanitize global configuration command, the RealProxy or RealServer access logs still display the client IP address even though it should be hidden.
Workaround: There is no known workaround.
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Symptom: The table of contents and the index of the ACNS Content Distribution Manager online help are not functioning. When you open the online help window, the left pane, which contains the table of contents and index, appears blank.
Condition: This problem is caused by the Windows Security Update MS05-001. This security patch prevents the creation of an instance of the HTML Help ActiveX control that is served in HTML content from outside the Local Machine zone.
Workaround: Because the ACNS Content Distribution Manager is part of your internal network, you may modify the Windows registry to allow execution of ActiveX controls that are served from within the intranet zone. For more information on modifying the registry to workaround this issue, refer to Microsoft Knowledge Base article 892675, which is available at this URL: http://support.microsoft.com/kb/892675.
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Symptom: When you perform a software upgrade or downgrade between the ACNS 5.3 software release and the ACNS 5.0 software release, the TCP Explicit Congestion Notification (ECN) configuration is not retained.
Condition: This problem can occur if you enter the tcp ecn enable global configuration command when the device is running the ACNS 5.0 software release, and then upgrade the device to the ACNS 5.3 software release.
Workaround: After upgrading the device to the ACNS 5.3 software release, reenter the tcp ecn enable command.
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Symptom: The cache process generates a core file.
Condition: This problem can occur under the following condition:
a.
b.
c.
d.
Workaround: There is no known workaround.
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When the WMT player is being proxied to the Content Engine, the player stops and starts buffering several times when it is playing a media file.
Condition: This problem can occur under the following condition:
a.
b.
Workaround: Enter the http ignore-resp-len-conn-hdr-check global configuration command, which is a hidden CLI command, on the Content Engine.
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Symptom: When you are trying to install the ACNS software on a Content Engine, DMA errors are displayed.
Condition: This problem only occurs under the following condition:
a.
b.
Installer Main Menu:1. Configure Network2. Manufacture flash3. Install flash cookie4. Install flash image from network5. Install flash image from cdrom6. Install flash image from disk7. Wipe out disks and install .bin image8. Exit (and reboot)Choice [0]: 7Workaround: The DMA errors are displayed four to five times in sequence and then the normal operation of the Content Engine continues without any user intervention.
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Symptom: A file not found error message is generated for a pre-positioned IP/TV VoD file.
Condition: The problem can occur with a pre-positioned file that is moved from its origin server to another server, and then restored back to its original server location.
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