Microsoft Exchange Client Access server “%1” attempted to proxy Outlook Web Access traffic to “%2”. This failed because “%2” could not verify that the Active Directory account “%3” used to authenticate has the necessary access rights to send Outlook Web Access proxy traffic.Additional information: %4.

Details
Product: Exchange
Event ID: 45
Source: MSExchange OWA
Version: 8.0
Symbolic Name: ProxyErrorAccessCheck
Message: Microsoft Exchange Client Access server “%1” attempted to proxy Outlook Web Access traffic to “%2”. This failed because “%2” could not verify that the Active Directory account “%3” used to authenticate has the necessary access rights to send Outlook Web Access proxy traffic.Additional information: %4.
   
Explanation

This Error event indicates that there is a problem in either the configuration of the Client Access server or the Active Directory directory service. This problem prevented Outlook Web Access from authenticating as it was proxied between two Client Access servers.

   
User Action

To resolve this error, do one or more of the following:

  • Check the group memberships of the Exchange Server service accounts.

  • If you have difficulty resolving the issue, contact Microsoft Customer Support. For information about how to contact support, visit Microsoft Help and Support.

For more information about permissions in Exchange Server 2007, see Permission Considerations.

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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