Error Message: The Exchange Conferencing Service May Not Have a Default Conferencing Mailbox Defined for It (329318)

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

When you try to schedule a conference by using Web Scheduler, you may receive the following error message:

The Exchange Conferencing Service may not have a default conferencing mailbox defined for it.

Please try the following:

Contact your system administrator.
Sending the message Error #80010105: Unable to schedule the specified conference.
Microsoft Exchange 2000 Conferencing Server

The following event ID message may be logged periodically in the Application event log on the Exchange 2000 Conferencing server: Event Type: Error Event
Source: MSExchangeCONF
Event Category: Startup/Shutdown
Event ID: 8212
Date: 5/21/2002
Time: 6:14:59 PM
User: N/A
Computer: COMPUTER
Description: The Microsoft Exchange Conference Management service could not log on to the Microsoft Exchange Information Store - idling until it can.

Error code: 81002746; Message: /o=Computer Information Systems/ou=First Administrative Group/cn=Recipients/cn=ECSCalendar

CAUSE

This problem may occur after you apply the Q299687 Windows 2000 security hotfix or the Q311401 Windows 2000 security rollup package on the global catalog server.

For additional information about this hotfix and security package, click the following article numbers to view the articles in the Microsoft Knowledge Base:

299687 Function Exposed by Using LDAP over SSL Could Enable Passwords to Be Changed

311401 Windows 2000 Security Rollup Package 1 (SR311401), January 2002

RESOLUTION

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
To resolve this problem, follow these steps on the global catalog server.

NOTE: Make the following registry change only if the global catalog servers have not been upgraded to Windows 2000 SP3.

In Control Panel, double-click Add/Remove Programs, and then locate the Windows 2000 Hotfix (Pre-SP3) (Q299687). Alternatively, locate the Windows 2000 Security Rollup Package (Q311401).
If either of these packages is listed, start Registry Editor, and then locate and click the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
Check the value of the RestrictAnonymous registry key on the global catalog server. If the value is set to 0x2 and either the Q299687 Windows 2000 security hotfix or the Q311401 Windows 2000 security rollup package is installed, change this value to 0x0.
Restart the global catalog server.

After you perform this procedure, Exchange Conferencing Service can create the Conference Calendar Mailbox.

For additional information about this procedure, click the following article number to view the article in the Microsoft Knowledge Base: