Table Of Contents
Using Virtual Network Computing Version 4.1
Virtual Network Computing (VNC) allows a system administrator to use a server to install applications or perform configuration tasks on a remote server while the user of the remote server views the tasks that occur. In this way, VNC operates similar to Microsoft Terminal Services.
Before You Begin
Review the following information before you install VNC:
About VNC Terminology
In this document, master server refers to the server where the user initiates, performs, and manages tasks; the remote server receives the software or configuration information from the master server.
About Compatible Operating System Versions
Make sure that you have installed Cisco-provided operating system version 2000.4.2 on all servers that will use VNC. For information on upgrading the operating system, refer to the documentation for the version of the Cisco CallManager upgrade that runs in the cluster.
About Security Risks
Be aware that using VNC poses a security risk by making the cluster vulnerable to attacks.
Installing VNC opens a network port, which may make the server vulnerable to attacks. A network scanner will show port 5900 "VNC => Remote Control Software" and allow an attacker to access the server.
During the VNC installation, enter a complex alphanumeric password for VNC. VNC limits the password to eight characters.
To minimize security risks, set the VNC service to Manual startup and start it only during remote management. This action ensures that users must enter a Windows user name/password that the server can authenticate before starting the service.
If you no longer plan to use Terminal Services for remote management, disable Terminal Services.
About Upgrading VNC
When you upgrade the operating system or run an operating system patch on the server, make sure that you review the operating system readme document for information on upgrading VNC. Cisco provides the VNC upgrade files in the operating system upgrade and/or operating system support patch, although Cisco does not automatically install these files on the server.
About Older Versions of VNC
Before you install VNC 4.1, uninstall any previous version of VNC that exists on the server. To uninstall VNC, choose Start > Programs > Settings > Add/Remove Programs.
About CPU Utilization
VNC may use a large percentage of CPU when you move the mouse and particularly when you move entire windows on the desktop. To minimize CPU utilization, limit unnecessary movements on the desktop, particularly while the server is in production.
Installing and Configuring VNC
Perform the following procedure to install and configure VNC Version 4.1 on all servers that will use VNC.
Step 1 Using Windows Explorer, browse to the following folder:
Step 2 In the VNC folder, double-click vnc-4.1_1-x86_win32.exe.
The Welcome window displays.
Step 3 Click Next.
Step 4 To accept the software license agreement, click I accept the agreement; then, click Next.
Step 5 In the Select Destination Directory, accept the default location or choose another folder where you want to install VNC; then, click Next.
Step 6 In the Select Components window, click Next.
Step 7 In the Select Start Menu Folder window, accept the default folder name or choose another folder where you want the setup program to create the program shortcuts; then, click Next.
Step 8 In the Select Additional Tasks window, check the Register VNC Server as a system service check box and the Start the VNC Server System service check box. If you want to create additional icons, check the check box next to the icons that you want to create; then, click Next.
The Ready to Install window displays.
Step 9 Click Install.
The VNC Server Properties window displays, as show in Figure 1.
Figure 1 VNC Server Properties Window
Step 10 In the Authentication pane, choose the VNC Password Authentication radio button, and click Configure to enter a password in the Password and Confirm Password fields.
You can enter a password of up to eight characters. You will use this password to open a VNC session between servers.
Step 11 In the Password window, click OK.
Step 12 Click the Connections tab; then, uncheck the Serve Java viewer via HTTP on port: 5800 check box.
Step 13 In the VNC Server Properties window, click OK.
Step 14 To continue the setup, click Next.
Step 15 Click Finish.
Starting a Remote Server from the Master Server
To start a remote server via VNC, perform the following procedure:
Step 1 From the master server, map a drive to the remote server by using the server name (not the IP address).
Step 2 Right-click My Computer and choose Manage.
Step 3 Choose Action > Connect to another computer....
The Select Computer dialog box displays.
Step 4 In the Name field, enter the name of the server to which you want to connect; then, click OK.
Step 5 In the Computer Management window, double-click Services and Applications.
Step 6 If an Internet Services Manager dialog displays, click Yes.
Step 7 Click Services.
Step 8 Right-click VNC Server Version 4; then, choose Start.
Using the Master Server to Perform Tasks on the Remote Server
Perform the following procedure to complete installation or configuration tasks via VNC:
Step 1 On the master server, choose Start > Programs > RealVNC > VNC Viewer 4 > Run VNC Viewer.
The Connection Details dialog box displays, as shown in Figure 2.
Figure 2 Connection Details dialog box
Step 2 In the Server field, enter the IP address of the remote server on which you want to install the software or perform a configuration task.
Step 3 Click OK.
The VNC Authentication dialog box displays, as shown in Figure 3.
Figure 3 VNC Authentication Dialog Box
Step 5 Click OK.
The desktop of the remote server displays.
Step 6 From the master server, install software or perform configuration tasks on the remote server.
Caution Make sure that you insert installation CD-ROMs into the CD-ROM drive of the remote server or download the files from the web onto the remote server.
Note When you are using a remote terminal over VNC to install Cisco CallManager on an IBM server, the procedure may seem to stall or hang during the installation. On the remote terminal, if you move (drag) the VNC window or refresh the screen by choosing Request screen refresh from the VNC application window menu (the menu that displays when you click the VNC icon in the left corner of the window title bar), the procedure will continue.
Step 7 Stop the VNC Server service.
Step 8 Perform the procedures in the "Starting a Remote Server from the Master Server" section and in the "Using the Master Server to Perform Tasks on the Remote Server" section for each remote server on which you want to perform installation or configuration tasks.
If you run VNC to install/upgrade Cisco CallManager on IBM xSeries servers, the installation may appear to hang when the server is copying the files during the installation. Move the mouse to continue the installation.
When VNC is used, some servers exhibit high CPU utilization. The server response may be slower than usual.
Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several ways to obtain technical assistance and other technical resources. These sections explain how to obtain technical information from Cisco Systems.
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Cisco Product Security Overview
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From this site, you can perform these tasks:
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Reporting Security Problems in Cisco Products
Cisco is committed to delivering secure products. We test our products internally before we release them, and we strive to correct all vulnerabilities quickly. If you think that you might have identified a vulnerability in a Cisco product, contact PSIRT:
•Emergencies — firstname.lastname@example.org
An emergency is either a condition in which a system is under active attack or a condition for which a severe and urgent security vulnerability should be reported. All other conditions are considered nonemergencies.
•Nonemergencies — email@example.com
In an emergency, you can also reach PSIRT by telephone:
•1 877 228-7302
•1 408 525-6532
Tip We encourage you to use Pretty Good Privacy (PGP) or a compatible product to encrypt any sensitive information that you send to Cisco. PSIRT can work from encrypted information that is compatible with PGP versions 2.x through 8.x.
Never use a revoked or an expired encryption key. The correct public key to use in your correspondence with PSIRT is the one linked in the Contact Summary section of the Security Vulnerability Policy page at this URL:
The link on this page has the current PGP key ID in use.
Obtaining Technical Assistance
Cisco Technical Support provides 24-hour-a-day award-winning technical assistance. The Cisco Technical Support & Documentation website on Cisco.com features extensive online support resources. In addition, if you have a valid Cisco service contract, Cisco Technical Assistance Center (TAC) engineers provide telephone support. If you do not have a valid Cisco service contract, contact your reseller.
Cisco Technical Support & Documentation Website
The Cisco Technical Support & Documentation website provides online documents and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The website is available 24 hours a day, at this URL:
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Note Use the Cisco Product Identification (CPI) tool to locate your product serial number before submitting a web or phone request for service. You can access the CPI tool from the Cisco Technical Support & Documentation website by clicking the Tools & Resources link under Documentation & Tools. Choose Cisco Product Identification Tool from the Alphabetical Index drop-down list, or click the Cisco Product Identification Tool link under Alerts & RMAs. The CPI tool offers three search options: by product ID or model name; by tree view; or for certain products, by copying and pasting show command output. Search results show an illustration of your product with the serial number label location highlighted. Locate the serial number label on your product and record the information before placing a service call.
Submitting a Service Request
Using the online TAC Service Request Tool is the fastest way to open S3 and S4 service requests. (S3 and S4 service requests are those in which your network is minimally impaired or for which you require product information.) After you describe your situation, the TAC Service Request Tool provides recommended solutions. If your issue is not resolved using the recommended resources, your service request is assigned to a Cisco engineer. The TAC Service Request Tool is located at this URL:
For S1 or S2 service requests or if you do not have Internet access, contact the Cisco TAC by telephone. (S1 or S2 service requests are those in which your production network is down or severely degraded.) Cisco engineers are assigned immediately to S1 and S2 service requests to help keep your business operations running smoothly.
To open a service request by telephone, use one of the following numbers:
Asia-Pacific: +61 2 8446 7411 (Australia: 1 800 805 227)
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For a complete list of Cisco TAC contacts, go to this URL:
Definitions of Service Request Severity
To ensure that all service requests are reported in a standard format, Cisco has established severity definitions.
Severity 1 (S1)—Your network is "down," or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation.
Severity 2 (S2)—Operation of an existing network is severely degraded, or significant aspects of your business operation are negatively affected by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation.
Severity 3 (S3)—Operational performance of your network is impaired, but most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels.
Severity 4 (S4)—You require information or assistance with Cisco product capabilities, installation, or configuration. There is little or no effect on your business operations.
Obtaining Additional Publications and Information
Information about Cisco products, technologies, and network solutions is available from various online and printed sources.
•Cisco Marketplace provides a variety of Cisco books, reference guides, documentation, and logo merchandise. Visit Cisco Marketplace, the company store, at this URL:
•Cisco Press publishes a wide range of general networking, training and certification titles. Both new and experienced users will benefit from these publications. For current Cisco Press titles and other information, go to Cisco Press at this URL:
•Packet magazine is the Cisco Systems technical user magazine for maximizing Internet and networking investments. Each quarter, Packet delivers coverage of the latest industry trends, technology breakthroughs, and Cisco products and solutions, as well as network deployment and troubleshooting tips, configuration examples, customer case studies, certification and training information, and links to scores of in-depth online resources. You can access Packet magazine at this URL:
•iQ Magazine is the quarterly publication from Cisco Systems designed to help growing companies learn how they can use technology to increase revenue, streamline their business, and expand services. The publication identifies the challenges facing these companies and the technologies to help solve them, using real-world case studies and business strategies to help readers make sound technology investment decisions. You can access iQ Magazine at this URL:
or view the digital edition at this URL:
•Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in designing, developing, and operating public and private internets and intranets. You can access the Internet Protocol Journal at this URL:
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