The Unified Messaging worker process is attempting to recover from an exception “%1” that was encountered during a call with ID %2.

Product: Exchange
Event ID: 1078
Source: MSExchange Unified Messaging
Version: 8.0
Symbolic Name: ExExceptionDuringCall
Message: The Unified Messaging worker process is attempting to recover from an exception “%1” that was encountered during a call with ID %2.

This Warning event indicates that an exception occurred in the Unified Messaging (UM) worker process. The exception occurred when the worker process tried to return a callback notification when an asynchronous call was finished. The UM worker process will try to recover the problem up to three times before the call referenced in the event description is disconnected.

This event may occur for one or more of the following reasons:

  • Network connectivity issues exist between domain controllers and the Unified Messaging server.

  • Incomplete data is returned by the domain controllers. Therefore, a data invalidation exception occurs.

  • A transient or permanent storage error occurred when data was retrieved from the computer that is running the Mailbox server role.

User Action

To resolve this warning, follow one or more of these steps:

  • Use the Ping or PathPing command-line tools to test basic connectivity. Use Ping to isolate network hardware problems and incompatible configurations. Use PathPing to detect packet loss over multiple-hop trips. For more information, see Microsoft Knowledge Base article 325487, How to troubleshoot network connectivity problems.

  • Review the Application log and System log for network-card-related events, connectivity-related events, or database-storage-related events. Use the information in those events to determine the root cause of this warning.

  • Check to see whether other computers that use the same default gateway and are plugged into the same hub or switch have also experienced connectivity problems. If the other computers that are connected to the same default gateway have not experienced network connectivity problems, the problem may be caused by a network adapter issue on a single computer. If this is the case, try to resolve this issue by following one or more of these steps:

    • Replace the network adapter with a network adapter that has been tested and proven reliable.

    • Update the driver for the network adapter driver to the latest version.

    • Replace the network cable between the failing system and the hub or switch.

  • Check the settings on the network adapter and uplink hardware. The uplink hardware is the hub or switch that is used by the computer that has the Unified Messaging server role installed. Make sure that all network hardware is configured correctly by taking these steps:

    • Make sure that the speed and duplex level settings are the same on all network hardware.

    • If the media type is set to autosense, autosensing, autodetect, or Auto Select, make sure that all components are autosensing correctly.

  • If this error frequently occurs, contact Microsoft Product Support. For information about how to contact support, 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.


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