|Message:||Process %1: %2 failed. Caller SIDs: %3. The exception returned is %4. Make sure that Active Directory site/forest containing the user mailbox has at least one local Exchange 2007 server running Exchange Availability service. Turn up logging for MSExchange Availability service and test basic network connectivity.|
This Error event indicates that the Microsoft Exchange Availability service could not successfully send a proxy Web request to another instance of the Exchange Availability service that is running in a different Active Directory directory service site or a different Active Directory forest. The Exchange Availability service retrieves the Schedule+ Free Busy and Out-of-Office (OOF) data for a set of mailboxes that resides on a computer that is running Exchange 2007 Server. This event may occur when an Exchange 2007 Client Access server and user mailbox are in different Active Directory sites or forests. Because the Exchange Availability service cannot directly connect to a mailbox that resides in a remote Active Directory forest, it sends a proxy Web request to another instance of the Exchange Availability service that is running in the remote Active Directory forest. The Exchange Availability service that is running in the remote Active Directory forest retrieves the requested information locally and passes the information back to the Exchange Availability service that requested the information.
This event may occur if one or more of the following conditions are true:
To resolve this error, do one or more of the following:
If you cannot resolve this error using the options suggested here, contact Microsoft Product Support Services. For more information, visit the Microsoft Help and Support Web site.
If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.