Microsoft KB Archive/940780

= The video connection fails, and you receive an error message when you use a Windows-based Live Meeting 2007 client on a Windows 2000 Service Pack 4-based computer to connect to an internal Communications Server 2007 A/V conferencing server =

Article ID: 940780

Article Last Modified on 8/20/2007

-

APPLIES TO


 * Microsoft Office Communications Server 2007
 * Microsoft Office Live Meeting 2007

-



SYMPTOMS
On a Windows 2000 Service Pack 4 (SP4)-based computer, you use a Microsoft Windows-based Microsoft Office Live Meeting 2007 client to connect to an internal Microsoft Office Communications Server 2007 A/V conferencing server. However, the video connection fails. Additionally, you receive the following error message in the Conference Center video window:

The audio and video server is configured to require encryption features that are not available with this version of Windows.

Action required: Please rejoin the meeting from a computer that has Windows XP or later installed.



CAUSE
This issue occurs because Windows 2000 SP4 does not support the level of encryption that the video connection requires.



WORKAROUND
To work around this issue, install the Windows-based Live Meeting 2007 client on a computer that supports the level of encryption that the video connection requires. Then, connect the Windows-based Live Meeting 2007 client to the Communications Server 2007 A/V Conferencing server.

The following operating systems support the level of encryption that the video connection requires:
 * Windows Vista, 32-bit versions
 * Windows Server 2003 Service Pack 1 (SP1)
 * Windows XP Professional Service Pack 2 (SP2)

Communications Server 2007 administrators can change the level of encryption to work around this issue. To do this, follow these steps.

Important These steps may increase your security risk. These steps may also make the computer or the network more vulnerable to attack by malicious users or by malicious software such as viruses. We recommend the process that this article describes to enable programs to operate as they are designed to or to implement specific program capabilities. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this process in your particular environment. If you decide to implement this process, take any appropriate additional steps to help protect the system. We recommend that you use this process only if you really require this process.  Open the Communications Server 2007 Microsoft Management Console (MMC). In the console tree, expand the forest node, and then perform one of the following actions:  For an Enterprise pool, expand Enterprise pools, expand the pool, right-click A/V Conferencing, and then click Properties. For a Standard Edition server, expand Standard Edition servers, right-click the pool, point to Properties, and then click A/V Conferencing Properties.  On the General tab, click Support encryption in the Encryption level list. Stop the A/V Conferencing Service, and then restart the A/V Conferencing Service. To do this, follow these steps: <ol style="list-style-type: lower-alpha;"> In the Communications Server 2007 Microsoft Management Console (MMC), right-click Office Communications Server 2007, point to Stop, and then click A/V Conferencing Service.</li> Right-click Office Communications Server 2007, point to Start, and then click A/V Conferencing Service.</li></ol> </li></ol>

Keywords: kbexpertiseinter kbtshoot kberrmsg kbprb KB940780

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.