Protocol Analysis Background agent warning. The queue this agent uses is full. This does not affect SRL calculations. Open proxy, reverse DNS, and sender blocking are affected.

Details
Product: Exchange
Event ID: 100
Source: MSExchange Antispam
Version: 8.0
Symbolic Name: AgentQueueFull
Message: Protocol Analysis Background agent warning. The queue this agent uses is full. This does not affect SRL calculations. Open proxy, reverse DNS, and sender blocking are affected.
   
Explanation

This Warning event indicates that the work queue that the Protocol Analysis agent uses is full. As stated in the event description, sender reputation level (SRL) calculations are not affected. Open proxy, reverse DNS, and sender blocking are affected. Specifically, each connection is processed on a first-in first-out basis. If the queue is full, no new connection data is submitted for processing. Therefore, new connections are delayed until the queue falls below the maximum value. This warning may appear during times when the server is functioning at peak design load.

For information about sender reputation anti-spam functionality on servers that run Microsoft Exchange Server 2007, see Sender Reputation.

   
User Action

No user action is required if this event rarely occurs. However, if the warning persists, follow one or more of these steps:

  • Review the Application event log for related events. For example, events that occur immediately before and after this event may provide more information about the root cause of this error.

  • If this event seems to be causing mail flow interruptions or other problems in your Exchange environment, contact Microsoft Product Support. For information about how to contact support, visit Microsoft Help and Support.

    Note   The maximum queue length is controlled by the msExchSenderReputationMaxWorkQueueSize attribute of the Sender Reputation object in the Message Hygiene options of the Transport Settings in the Active Directory directory service.

    The default value for msExchSenderReputationMaxWorkQueueSize attribute is 1,000.

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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