Windows DNS Client optimizations present in Windows 8 and above may result in failure to resolve certain domain names when split DNS is enabled. The workaround is to disable such optimizations by updating the following registry keys:

Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters

Value:DisableParallelAandAAAA

Data: 1

Key: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\DNSClient

Value: DisableSmartNameResolution

Data: 1

The macOS 10.15 operating system does not support 32-bit binaries. Additionally, Apple verifies that all software installed on 10.15 has been cryptographically notarized via digital signature. For the best user experience, we recommend upgrading to AnyConnect 4.8, because it is the first version that officially supports operation on macOS 10.15 and contains no 32-bit code.

Otherwise, make note of these limitations:

• AnyConnect versions prior to 4.7.03052 may require an active internet connection to upgrade.

• AnyConnect HostScan versions prior to 4.8.x will not function on macOS 10.15. Refer to HostScan Will Not Function With macOS 10.15 Without Upgrade (CSCvq11813).

• AnyConnect HostScan and SystemScan users on macOS 10.15 will experience permission popups during initial launch. Refer to Permission Popups During Initial AnyConnect HostScan or System Scan Launch (CSCvq64942).

AnyConnect HostScan packages earlier than 4.8.x will not function with macOS Catalina (10.15). End users who attempt to connect from macOS Catalina to ASA headends running HostScan packages earlier than 4.8.x will not be able to successfully complete VPN connections, receiving a posture assessment failed message.

To enable successful VPN connections for HostScan users, all DAP and HostScan policies must be HostScan 4.8.00175 (or later) compatible. Refer to AnyConnect HostScan Migration 4.3.x to 4.6.x and Later for additional information related to policy migration from HostScan 4.3.x to 4.8.x.

As a workaround to restore VPN connectivity, administrators of systems with HostScan packages on their ASA headends may disable HostScan. If disabled, all HostScan posture functionality, and DAP policies that depend on endpoint information, will be unavailable.

The associated field notice can be found here: https://www.cisco.com/c/en/us/support/docs/field-notices/704/fn70445.html.

macOS 10.15 (and later) requires that applications obtain user permissions for access to Desktop, Documents, Downloads, and Network Volume folders. To grant this access, you may see popups during an initial launch of HostScan, System Scan (when ISE posture is enabled on the network), or DART (when ISE posture or HostScan is installed). ISE posture and HostScan use OPSWAT for posture assessment on endpoints, and the posture checks access these folders based on the product and policies configured.

At these popups, you must click OK to have access to these folders and to continue with the posture flow. If you click Don't Allow, the endpoint may not remain compliant, and the posture assessment and remediation may fail without access to these folders.

To Remedy a Don't Allow Selection

The permission popups will reappear with a subsequent start of posture, and the user can click OK to grant access.

You cannot use PMK-based roaming with Network Access Manager on Windows.

Due to system security restrictions, DART now requires administrator privileges on macOS, Ubuntu 18.04, and Red Hat 7 to collect logs.

(Only Impacting RedHat and Ubuntu users prior to 18.04) Because NSS certificate store DB format changed starting with Firefox 58, an environment variable change is required for AnyConnect to comply with this change and to prevent needing an operating system upgrade. Set NSS_DEFAULT_DB_TYPE="sql" as a workaround to use the new SQL DB format. Once NSS is updated to version 3.35 or later, this environment variable is no longer required, and it will default to use SQL DB.

If your wired or wireless network settings or specific SSIDs are pushed from a Windows group policy, they can conflict with the proper operation of the Network Access Manager. With the Network Access Manager installed, a group policy for wireless settings is not supported.

On macOS, a keychain authentication prompt may appear after the VPN connection is initiated. The prompt only occurs when access to a client certificate private key is necessary, after a client certificate request from the secure gateway. Even if the tunnel group is not configured with certificate authentication, certificate mapping may be configured on the ASA, causing the keychain prompts when the access control setting for the client certificate private key is configured as Confirm Before Allowing Access.

Configure the AnyConnect VPN profile to restrict AnyConnect access strictly to clients certificates from the login keychain (in the ASDM profile editor, choose Login under Preferences (Part 1) - Certificate Store - macOS). You can stop the keychain authentication prompts with one of the following actions:

• Configure the certificate matching criteria in the client profile to exclude well-known system keychain certificates.

• Configure the access control setting for the client certificate private keys in the system keychain to allow access to AnyConnect.

CSCuv78008 tracks an enhancement request to extend support for profile-based certificate store filtering to macOS. This enhancement allows you to restrict AnyConnect access strictly to user certificates from the login keychain without configuring certificate matching criteria in the profile.

Microsoft intended to block updates to earlier versions of Windows when the Network Access Manager is installed, but Windows 10 and Creators Edition (RS2) were inadvertently blocked as well. Because of the error (Microsoft Sysdev 11911272), you must first uninstall the Network Access Manager module before you can upgrade to the Creators Editor (RS2). You can then reinstall the module after the upgrade. Microsoft's fix for this error is planned for June 2017.

When upgrading to Windows 10 Creator Update (April 2017), you may encounter a Windows Defender message that the AnyConnect adapter has an issue. Windows Defender instructs you to enable the adapter under the Device Performance and Health section. In actuality, the adapter should be disabled when not in use, and no manual action should be taken. This false positive error has been reported to Microsoft under Sysdev # 11295710.

AnyConnect 4.4MR1 (or later) and 4.3MR5 are compatible with Windows 10 Creators Edition (RS2).

AnyConnect 4.1MR4(4.1.04011) and later are compatible with Windows 10 official release. Technical Assistance Center (TAC) support is available beginning on 7/29/2015.

For best results, we recommend a clean install of AnyConnect on a Windows 10 system and not an upgrade from Windows 7/8/8.1. If you are planning to perform an upgrade from Windows 7/8/8.1 with AnyConnect pre-installed, make sure that you first upgrade AnyConnect prior to uprading the operating system. The Network Access Manager Module must be uninstalled prior to upgrading to Windows 10. After the system upgrade is complete, you can re-install Network Access Manager on the system. You may also choose to fully uninstall AnyConnect and re-install one of the supported versions after upgrading to Windows 10.

Because AnyConnect is a Win32 (not a Windows store) application, we have limitations with Microsoft regarding privileges; therefore, AnyConnect cannot provide access to the Connected Standby (suspend and resume events) status in Windows 8 and later.

DAP and group policy's Always On disabled head end setting will not be enforced by AnyConnect beyond a reboot. If the client has Always On enabled in the VPN profile and receives a DAP or group policy Always On disabled setting, Always On will not remain disabled after the next system reboot.

However, head end settings pertaining to the ApplyLastVPNLocalResourceRules Always On profile setting (such as excluded networks, client public firewall rules configured in the group policy, and so on) remain enforced after reboot. This related functionality allows local LAN access with Always On enabled and a fail close policy to remain operational after a VPN connection failure.

Because of architectural changes in Symantec products, ISE posture cannot support remediation from Symantec AV 12.1.x and onwards.

A secure gateway with a SHA-1 certificate or a certificate with SHA-1 intermediate certificates may no longer be considered valid by a Windows Internet Explorer 11 / Edge browser or a Windows AnyConnect endpoint after February 14, 2017. After February 14, 2017, Windows endpoints may no longer consider a secure gateway with a SHA-1 certificate or intermediate certificate as trusted. We highly recommend that your secure gateway does not have a SHA-1 identity certificate and that any intermediate certificates are not SHA-1.

Microsoft has made modifications to their original plan of record and timing. They have published details for how to test whether your environment will be impacted by their February 2017 changes. Cisco is not able to make any guarantees of correct AnyConnect operation for customers with SHA-1 secure gateway or intermediate certificates or running old versions of AnyConnect.

Cisco highly recommends that customers stay up to date with the current maintenance release of AnyConnect in order to ensure that they have all available fixes in place. The most up-to-date version of AnyConnect 4.x and beyond are available Cisco.com Software Center for customers with active AnyConnect Plus, Apex, and VPN Only terms/contracts. AnyConnect Version 3.x is no longer actively maintained and should no longer be used for any deployments.

Note

Cisco has validated that AnyConnect 4.3 and 4.4 (and beyond) releases will continue to operate correctly as Microsoft further phases out SHA-1. Long term, Microsoft intends to distrust SHA-1 throughout Windws in all contexts, but their current advisory does not provide any specifics or timing on this. Depending on the exact date of that deprecation, many earlier versions of AnyConnect may no longer operate at any time. Refer to Microsoft's advisory for further information.

(For Windows 7, 8, and 8.1 users) When the client uses a SHA512 certificate for authentication, authentication fails, even though the client logs show that the certificate is being used. The ASA logs correctly show that no certificate was sent by AnyConnect. These versions of Windows require that you enable support for SHA512 certificates in TLS 1.2, which is not supported by default. Refer to https://support.microsoft.com/en-us/kb/2973337 for information on enabling support for these SHA512 certificates.

RC4 TLS cipher suites are not supported from AnyConnect release 4.2.01035 and onwards due to security policy enhancements.

Because the OpenSSL standards development team marked some cipher suites as compromised, we no long support them beyond AnyConnect 3.1.05187. The unsupported cipher suites include the following: DES-CBC-SHA, RC4-SHA, and RC4-MD5.

Likewise, our crypto toolkit has discontinued support for RC4 ciphers; therefore, our support for them will be dropped with releases 3.1.13011 and 4.2.01035 and beyond.

The Cisco AnyConnect Secure Mobility Client is supported on the Mac OS X El Capitan 10.11 operating system.

After a fresh installation, you see ISE posture log trace messages as expected. However, if you go into the ISE Posture Profile Editor and change the Enable Agent Log Trace file to 0 (disable), you must do an AnyConnect service restart to get expected results.

If you are using macOS 10.9 or later and want to use ISE posture, you may need to do the following to avoid issues:

• Turn off certificate validation to avoid a "failed to contact policy server" error during posture assessment.

• Disable the captive portal application; otherwise, discovery probes are blocked, and the application remains in pre-posture ACL state.

Many sites position the Certificate Authority  they use to validate server certificates inside the corporate network. That means that a client cannot verify CRL when it is trying to connect to a headend, since the CRL is not accessible on the public network. The client operating system can be configured to verify CRL in Windows and Mac OS X, but we ignore that setting.

The Firefox certificate store on macOS is stored with permissions that allow any user to alter the contents of the store, which allows unauthorized users or processes to add an illegitimate CA into the trusted root store. AnyConnect no longer utilizes the Firefox store for either server validation or client certificates.

If necessary, instruct your users how to export your AnyConnect certificates from their Firefox certificate stores, and how to import them into the macOS keychain. The following steps are an example of what you may want to tell your AnyConnect users.

1. Navigate to Firefox > Preferences > Privacy & Security > Advanced, Certificates tab, click View Certificates.

2. Select the Certificate used for AnyConnect, and click Export.

   Your AnyConnect Certificate(s) will most likely be located under the Authorities category. Verify with your Certificate Administrator, as they may be located under a different category (Your Certificates or Servers).

3. Select a location to save the Certificate(s), for example, a folder on your desktop.

4. In the Format pull down menu, select X.509 Certificate (DER). Add the .der extension to the certificate name, if required.

   

   Note	If more than one AnyConnect Certificate and/or a Private Key is used/required, repeat the above process for each Certificate).

5. Launch KeyChain. Navigate to File, Import Items…, and select the Certificate that you exported from Firefox.

   In the Destination Keychain:, select the desired Keychain. The login Keychain that is used for this example may not be the one used at your company. Ask your Certificate Administrator to which Keychain your certificate(s) should be imported.

6. In the Destination Keychain:, select the desired Keychain. The login Keychain that is used for this example may not be the one used at your company. Ask your Certificate Administrator to which keychain your certificate(s) should be imported.

   
   

   

   
   

7. Repeat the preceding steps for additional Certificates that are used or required for AnyConnect.

error while loading shared libraries: libpangox-1.0.so.0: cannot open shared
object file: No such file or directory

Pango has released the source code of a compatible library that has been built by others and is available online. To resolve this problem, find and install either the package pangox-compat-0.0.2-2.el7.x86_64.rpm or pangox-compat-0.0.2-3.fc20.x86_64.rpm.

(CSCue04930) HostScan does not function when the SSLv3 options SSLv3 only or Negotiate SSL V3 are chosen in ASDM (Configuration > Remote Access VPN > Advanced > SSL Settings > The SSL version for the security appliance to negotiate as a server). A warning message displays in ASDM to alert the administrator.

We have seen instances where Apple's Broadband Tuner application (from 2005) was used with Mac OS X 10.9, That application changes the network settings in sysctl.conf, which can cause connection problems. That application was designed for much older versions of the Mac OS. We suspect that the current default OS settings take broadband networks into consideration, so most users will not need to take any action.

Running AnyConnect 3.1.04074 along with the modified sysctl settings may generate the following message:

The VPN client driver encountered an error..please restart

To Verify

To verify that the sysctl network setting is the cause of the problem, open a Terminal window and type:

sysctl -a | grep maxsockbuf

If the results contain a value much lower than the default value of 8388608, for example:

kern.ipc.maxsockbuf: 512000

Then this value may have been overritten in /etc/sysctl.conf by Apple's Broadband Tuner application

To Fix

Edit /etc/sysctl.conf, comment out the line that sets kern.ipc.maxsockbuf, and reboot the computer.

OR

If you have no other Customization other than the one set by the Broadband Tuner application, rename or delete sysctl.conf.

Apple is aware of this problem, and has opened Bug ID: 15542576.

There is an issue with Weblaunch with Safari. The default security settings in the version of Safari that comes with OS X 10.9 (Mavericks) prevents AnyConnect Weblaunch from working. To configure Safari to allow Weblaunch, edit the URL of the ASA to Unsafe Mode, as described below.

Safari 9 (and earlier)

1. Open Safari Preferences.

2. Choose Security preference.

3. Click Manage Website Settings... button.

4. Choose Java from the options listed on the left side.

5. Change the option from Block to Allow Always for the website "Hostname_or_IP_address" that you are trying to connect to.

6. Click Done.

Safari 10 (and later)

1. Open Safari Preferences.

2. Choose Security preference.

3. Check the Internet plug-ins: option to allow plug-ins.

4. Choose Plug-in Settings button.

5. Choose Java from the options listed on the left side.

6. Highlight the "Hostname_or_IP_address" that you are trying to connect to.

7. Hold Alt (or Option) and click the drop-down menu. Make sure that On is checked, and Run in Safe Mode is unchecked.

8. Click Done.

Automatic upgrades of AnyConnect software via WebLaunch will work with limited user accounts as long as there are no changes required for the ActiveX control.

Occasionally, the control will change due to either a security fix or the addition of new functionality.

Should the control require an upgrade when invoked from a limited user account, the administrator must deploy the control using the AnyConnect pre-installer, SMS, GPO or other administrative deployment methodology.

Java 7 can cause problems with AnyConnect Secure Mobility Client, Hostscan, CSD and Clientless SSL VPN (WebVPN). A description of the issues and workarounds is provide in the Troubleshooting Technote Java 7 Issues with AnyConnect, CSD/Hostscan, and WebVPN - Troubleshooting Guide, which is in Cisco documentation under Security > Cisco Hostscan.

Supported versions of Internet Explorer stop working when the user attempts to connect to the ASA, when Java 7 is installed on the endpoint, when HostScan is installed and enabled on the ASA, and when AnyConnect 3.1.1 is installed and enabled on the ASA.

This does not happen when Active X or earlier versions of Java 7 are installed. To avoid this, use a supported version of Java on the endpoint that is earlier than Java 7.

Refer to the Bug Toolkit and defect CSCuc48299 to verify.

To allow local DHCP traffic to flow in the clear when Tunnel All Networks is configured, AnyConnect adds a specific route to the local DHCP server when the AnyConnect client connects. To prevent data leakage on this route, AnyConnect also applies an implicit filter on the LAN adapter of the host machine, blocking all traffic for that route except DHCP traffic.

Cisco has qualified the AnyConnect VPN client over a bluetooth or USB tethered Apple iPhone only. Network connectivity provided by other tethered devices should be verified with the AnyConnect VPN client before deployment.

AnyConnect supports Smartcard provided credentials in the following environments:

• Microsoft CAPI 1.0 and CAPI 2.0 on Windows7, Windows 8, and Windows 10.

• Keychain on macOS.

  Note	AnyConnect does not support Smart cards on Linux or PKCS #11 devices.

Cisco performs a portion of AnyConnect client testing using these virtual machine environments:

• VMWare ESXi Hypervisor (vSphere) 4.0.1 and later

• VMWare Fusion 2.x, 3.x, and 4.x

We do not support running AnyConnect in virtual environments; however, we expect AnyConnect to function properly in the VMWare environments we test in.

If you encounter any issues with AnyConnect in your virtual environment, report them. We will make our best effort to resolve them.

AnyConnect 3.0 or later used with ASA 8.4(1) or later supports UTF-8 characters in passwords sent using RADIUS/MSCHAP and LDAP protocols.

When Auto Update is disabled for a client running AnyConnect, the ASA must have the same version of AnyConnect or earlier installed, or the client will fail to connect to the VPN.

To avoid this problem, configure the same version or earlier AnyConnect package on the ASA, or upgrade the client to the new version by enabling Auto Update.

When the Network Access Manager operates, it takes exclusive control over the network adapters and blocks attempts by other software connection managers (including the Windows native connection manager) to establish connections. Therefore, if you want AnyConnect users to use other connection managers on their endpoint computers (such as iPassConnect Mobility Manager), they must disable Network Access Manager either through the Disable Client option in the Network Access Manager GUI, or by stopping the Network Access Manager service.

The Intel wireless network interface card driver, version 12.4.4.5, is incompatible with Network Access Manager. If this driver is installed on the same endpoint as the Network Access Manager, it can cause inconsistent network connectivity and an abrupt shutdown of the Windows operating system.

The AnyConnect client relies on the Windows Cryptographic Service Provider (CSP) of the certificate for hashing and signing of data required during the IKEv2 authentication phase of the IPsec/IKEv2 VPN connection. If the CSP does not support SHA 2 algorithms, and the ASA is configured for the pseudo-random function (PRF) SHA256, SHA384, or SHA512, and the connection profile (tunnel-group) is configured for certificate or certificate and AAA authentication, certificate authentication fails. The user receives the message Certificate Validation Failure.

This failure occurs for Windows only, for certificates that belong to CSPs that do not support SHA 2-type algorithms. Other supported OSs do not experience this problem.

To avoid this problem you can configure the PRF in the IKEv2 policy on the ASA to md5 or sha (SHA 1). Alternatively, you can modify the certificate CSP value to native CSPs that work such as Microsoft Enhanced RSA and AES Cryptographic Provider. Do not apply this workaround to SmartCards certificates. You cannot change the CSP names. Instead, contact the SmartCard provider for an updated CSP that supports SHA 2 algorithms.

Caution

Performing the following workaround actions could corrupt the user certificate if you perform them incorrectly. Use extra caution when specifying changes to the certificate.

You can use the Microsoft Certutil.exe utility to modify the certificate CSP values. Certutil is a command-line utility for managing a Windows CA, and is available in the Microsoft Windows Server 2003 Administration Tools Pack. You can download the Tools Pack at this URL:

http://www.microsoft.com/downloads/en/details.aspx?FamilyID=c16ae515-c8f4-47ef-a1e4-a8dcbacff8e3&displaylang=en

Follow this procedure to run Certutil.exe and change the Certificate CSP values:

1. Open a command window on the endpoint computer.

2. View the certificates in the user store along with their current CSP value using the following command:certutil -store -user My

   The following example shows the certificate contents displayed by this command:

   
   ================ Certificate 0 ================
   Serial Number: 3b3be91200020000854b
   Issuer: CN=cert-issuer, OU=Boston Sales, O=Example Company, L=San Jose,
   S=CA, C=US, E=csmith@example.com
   NotBefore: 2/16/2011 10:18 AM
   NotAfter: 5/20/2024 8:34 AM
   Subject: CN=Carol Smith, OU=Sales Department, O=Example Company, L=San Jose, S=C
   A, C=US, E=csmith@example.com
   Non-root Certificate
   Template:
   Cert Hash(sha1): 86 27 37 1b e6 77 5f aa 8e ad e6 20 a3 14 73 b4 ee 7f 89 26
     Key Container = {F62E9BE8-B32F-4700-9199-67CCC86455FB}
     Unique container name: 46ab1403b52c6305cb226edd5276360f_c50140b9-ffef-4600-ada
   6-d09eb97a30f1
     Provider = Microsoft Enhanced RSA and AES Cryptographic Provider
   Signature test passed
   

3. Identify the <CN> attribute in the certificate. In the example, the CN is Carol Smith. You need this information for the next step.

4. Modify the certificate CSP using the following command. The example below uses the subject <CN> value to select the certificate to modify. You can also use other attributes.

   On Windows 7 or later, use this command: certutil -csp "Microsoft Enhanced RSA and AES Cryptographic Provider" -f -repairstore -user My <CN> carol smith

5. Repeat step 2 and verify the new CSP value appears for the certificate.

IKEv2 does not support the public-side proxy. If you need support for that feature, use SSL. Private-side proxies are supported by both IKEv2 and SSL as dictated by the configuration sent from the secure gateway. IKEv2 applies the proxy configuration sent from the gateway, and subsequent HTTP traffic is subject to that proxy configuration.

AnyConnect sometimes receives and drops packet fragments with some routers, resulting in a failure of some web traffic to pass.

To avoid this, lower the value of the MTU. We recommend 1200. The following example shows how to do this using CLI:

hostname# config t
hostname(config)# group-policy DfltGrpPolicy attributes
hostname(config-group-policy)# webvpn
hostname(config-group-webvpn)# anyconnect mtu 1200

To set the MTU using ASDM, go to Configuration > Network (Client) Access > Group Policies > Add or Edit > Advanced > SSL VPN Client.

If Dead Peer Detection (DPD) is enabled for DTLS, the client automatically determines the path MTU. If you previously reduced the MTU using the ASA, you should restore the setting to the default (1406). During tunnel establishment, the client auto-tunes the MTU using special DPD packets. If you still have a problem, use the MTU configuration on the ASA to restrict the MTU as before.

To use Network Access Manager, you may need to adjust the FreeRADIUS configuration. Any ECDH related ciphers are disabled by default to prevent vulnerability. In /etc/raddb/eap.conf, change the cipher_list value.

A mobile endpoint running Windows 7 or later must do a full EAP authentication instead of leveraging the quicker PMKID reassociation when the client roams between access points on the same network. Consequently, in some cases, AnyConnect prompts the user to enter credentials for every full authentication if the active profile requires it.

Unless an exception for an IPv6 address, domain name, address range, or wild card is specified, IPv6 web traffic is sent to the scanning proxy where it performs a DNS lookup to see if there is an IPv4 address for the URL the user is trying to reach. If the scanning proxy finds an IPv4 address, it uses that for the connection. If it does not find an IPv4 address, the connection is dropped.

If you want all IPv6 traffic to bypass the scanning proxies, you can add this static exception for all IPv6 traffic ::/0. Doing this makes all IPv6 traffic bypass all scanning proxies. This means that IPv6 traffic is not protected by Cisco Cloud Web Security.

After one uses AnyConnect to establish a VPN session with Windows 7 or later on a remote LAN, the network browsers on the other devices in the user’s LAN display the names of hosts on the protected remote network. However, the other devices cannot access these hosts.

To ensure the AnyConnect host prevents the hostname leak between subnets, including the name of the AnyConnect endpoint host, configure that endpoint to never become the primary or backup browser.

1. Enter regedit in the Search Programs and Files text box.

2. Navigate to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Browser\Parameters\

3. Double-click MaintainServerList.

The Edit String window opens.

1. Enter No.

2. Click OK.

3. Close the Registry Editor window.

An AnyConnect certificate revocation warning popup window opens after authentication if AnyConnect attempts to verify a server certificate that specifies the distribution point of an LDAP certificate revocation list (CRL) if the distribution point is only internally accessible.

If you want to avoid the display of this popup window, do one of the following:

• Obtain a certificate without any private CRL requirements.

• Disable server certificate revocation checking in Internet Explorer.

  Caution

  Disabling server certificate revocation checking in Internet Explorer can have severe security ramifications for other uses of the OS.

If you try to search for messages in the localization file, they can span more than one line, as shown in the example below:

msgid ""
"The service provider in your current location is restricting access to the "
"Secure Gateway. "

When the AnyConnect client for macOS attempts to create an SSL connection to a gateway running IOS, or when the AnyConnect client attempts to create an IPsec connection to an ASA from behind certain types of routers (such as the Cisco Virtual Office (CVO) router), some web traffic may pass through the connection while other traffic drops. AnyConnect may calculate the MTU incorrectly.

To work around this problem, manually set the MTU for the AnyConnect adaptor to a lower value using the following command from the macOS command line:

sudo ifconfig utun0 mtu 1200 (For macOS v10.7 and later)

On Windows computers, users with limited or standard privileges may sometimes have write access to their program data folders. This could allow them to delete the AnyConnect profile file and thereby circumvent the always-on feature. To prevent this, configure the computer to restrict access to the C:\ProgramData folder, or at least the Cisco sub-folder.

Using the Windows 7 or later Wireless Hosted Network feature can make AnyConnect unstable. When using AnyConnect, we do not recommend enabling this feature or running front-end applications that enable it (such as Connectify or Virtual Router).

AnyConnect requires the ASA to accept TLSv1 traffic, but not SSLv3 traffic. The SSLv3 key derivation algorithm uses MD5 and SHA-1 in a way that can weaken the key derivation. TLSv1, the successor to SSLv3, resolves this and other security issues present in SSLv3.

Thus, the AnyConnect client cannot establish a connection with the following ASA settings for “ssl server-version”:

ssl server-version sslv3

ssl server-version sslv3-only

If you have Trend Micro on your device, the Network Access Manager will not install because of a driver conflict. You can uninstall the Trend Micro or uncheck trend micro common firewall driver to bypass the issue.

None of the supported antimalware and firewall products report the last scan time information. HostScan reports the following:

• For antimalware

  • Product description

  • Product version

  • File system protection status (active scan)

  • Data file time (last update and timestamp)

• For firewall

  • Product description

  • Product version

  • Is firewall enabled

You may experience long reconnects on Windows if IPv6 is enabled and auto-discovery of proxy setting is either enabled in Internet Explorer or not supported by the current network environment. As a workaround, you can disconnect any physical network adapters not used for VPN connection or disable proxy auto-discovery in IE, if proxy auto-discovery is not supported by the current network environment. With release 3.1.03103, those with multi-homed systems may also experience the long reconnects.

On Windows 7 or later, user accounts with limited privileges cannot upgrade ActiveX controls and therefore cannot upgrade the AnyConnect client with the web deploy method. For the most secure option, Cisco recommends that users upgrade the client from within the application by connecting to the headend and upgrading.

Note	If the ActiveX control was previously installed on the client using the administrator account, the user can upgrade the ActiveX control.

If users WebLaunch from the ASA headend to start AnyConnect on a macOS, and the Java installer fails, a dialog box presents a Manual Install link. Users should do the following when this happens:

1. Click Manual Install. A dialog box presents the option to save a .dmg file that contains a macOS installer.

2. Mount the disk image (.dmg) file by opening it and browsing to the mounted volume using Finder.

3. Open a Terminal window and use the CD command to navigate to the directory containing the file saved. Open the .dmg file and run the installer.

4. Following the installation, choose Applications > Cisco > Cisco AnyConnect Secure Mobility Client to initiate an AnyConnect session, or use Launchpad.

Network Access Manager does not support PKC or CCKM caching. On Windows 7, fast roaming with a non-Cisco wireless card is unavailable.

The AnyConnect Secure Mobility Client includes an Application Programming Interface (API) for those who want to write their own client programs.

The API package contains documentation, source files, and library files to support a C++ interface for the Cisco AnyConnect VPN Client. You can use the libraries and example programs for building on Windows, Linux and MAC platforms. The Makefiles (or project files) for the Windows platform are also included. For other platforms, it includes platform specific scripts showing how to compile the example code. Network administrators can link their application (GUI, CLI, or embedded application) with these files and libraries.

You can download the APIs from Cisco.com.

For support issues regarding the AnyConnect API, send e-mail to the following address: anyconnect-api-support@cisco.com.