XCON: Connector Delivery Restrictions May Not Work Correctly

After you configure the delivery restrictions on a connector by using Microsoft Exchange 2000 Server or Microsoft Exchange Server 2003, the restriction settings may not be applied. In Exchange 2000, the following event ID will also be generated:

If you need to apply a distribution list-based restriction to a connector, you must manually enable the checking process for these restrictions. Restriction checking is controlled by a registry key that must be set on the Exchange bridgehead that is the source for the connector that is being checked. If you specify a restriction, but do not create the registry key, the restriction is not checked.

Connector restriction checking is turned off by default because it can significantly affect performance to expand distribution groups and check the restrictions for each message that passes through the system. If possible, turn on this setting on where it is necessary (for example, on the bridgehead server for the restricted connector).

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
To resolve this issue:

1. Start Registry Editor (Regedt32.exe).
2. Locate and click the following registry key:
   HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/Resvc/Parameters/
3. On the Edit menu, click Add Value, and then add the following registry value:
   Value Name: CheckConnectorRestrictions
   Data Type: REG_DWORD
   Radix: Hexadecimal
   Value: 1
4. Quit Registry Editor.
5. Restart the Microsoft Exchange Routing Engine service and the Simple Mail Transfer Protocol (SMTP) services for this change to take effect.

This information can also be found in the Release Notes that are included with the Exchange CD-ROM.