XCCC: Internet Clients Can Join a Conference After You Restrict Server Visibility (330335)

SYMPTOMS

After you restrict client access to a T.120 MCU server, the client may be able to connect to the server and join the conference, although the Internet Protocol (IP) address of the client does not fall in the scope mask that you defined. The steps to restrict client access are listed in the "More Information" section of this article.

CAUSE

This issue may occur if the following conditions exist:

Your network is made up of a single Active Directory site in which no additional site and subnet pairs are defined.
The T.120 MCU server is configured to accept client connections from the Internet.

This issue may also occur with Internet clients in a single-site environment. When you restrict server visibility and only one site exists in which no additional site and subnet pairs are defined, Exchange Conferencing Server assumes that clients are on the default site. For example, Default-First-Site-Name.

RESOLUTION

To resolve this issue, use the Active Directory Sites and Services snap-in to create a fictitious Active Directory site, and then associate a subnet with the site. You must configure more than one Active Directory site before the Conference Management service can distinguish whether users are connecting locally or are connecting from the Internet. If you do not configure more than one site, all users appear to come from the default site.

For additional information about how to create and configure a site in Active Directory, click the article number below to view the article in the Microsoft Knowledge Base:

318480 HOW TO: Create and Configure an Active Directory Site in Windows 2000

MORE INFORMATION

To restrict client access to a T.120 MCU server:

Start Exchange Conferencing Manager, and then connect to the Conference Management service.
Click Data Conferencing Provider, right-click the T.120 MCU server, click Properties, and then click the Visibility tab.
Click Add, and then type the network addresses and subnet masks of clients that you do not want to see this server.

For additional information about how to configure Exchange 2000 Conferencing Server for Internet clients, click the article number below to view the article in the Microsoft Knowledge Base:

280444 XCCC: How to Configure Exchange 2000 Conferencing Server for Internet Attendees

For more information about how to use Exchange 2000 Conferencing Server over the Internet, see the "Using Microsoft Exchange 2000 Conferencing Server over the Internet" white paper. To view this white paper, visit the following Microsoft Web site:

http://www.microsoft.com/exchange/techinfo/administration/2000/E2KCSInternet.asp

For more information about Exchange 2000 Conferencing Server, visit the following Microsoft Web site:

http://www.microsoft.com/exchange/techinfo/conferencing/default.asp