Client Access server “%1”, running Microsoft Exchange version “%2”, is proxying Outlook Web Access traffic to Client Access server “%3”, which runs Exchange version “%4”. To ensure reliable interoperability, the proxying Client Access server needs to be running a newer version of Exchange than the Client Access server it is proxying to. If the proxying Client Access server is running a newer version of Exchange than the Client Access server it is proxying to, the proxying Client Access server needs to have an Outlook Web Access resource folder (for example, “)\ClientAccess\owa\8.0.498.0” that contains all the same versioned resource files as the Client Access server it is proxying to. If you will be running Outlook Web Access proxying with mismatched server versions, you can manually copy this resource folder to the proxying Client Access server.

Details
Product: Exchange
Event ID: 46
Source: MSExchange OWA
Version: 8.0
Symbolic Name: ProxyErrorCASCompatibility
Message: Client Access server “%1”, running Microsoft Exchange version “%2”, is proxying Outlook Web Access traffic to Client Access server “%3”, which runs Exchange version “%4”. To ensure reliable interoperability, the proxying Client Access server needs to be running a newer version of Exchange than the Client Access server it is proxying to. If the proxying Client Access server is running a newer version of Exchange than the Client Access server it is proxying to, the proxying Client Access server needs to have an Outlook Web Access resource folder (for example, “<Exchange Server installation path>)\ClientAccess\owa\8.0.498.0” that contains all the same versioned resource files as the Client Access server it is proxying to. If you will be running Outlook Web Access proxying with mismatched server versions, you can manually copy this resource folder to the proxying Client Access server.
   
Explanation

This Error event indicates that a Microsoft Office Outlook Web Access proxy request failed when it was sent from one computer that is running the Client Access server role to another Client Access server. This error is logged when the version of the Outlook Web Access resources folders on one Client Access server does not match the version on the other Client Access server.

   
User Action

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

  • Make sure that both Client Access servers are running the same version of Microsoft Exchange Server 2007. Both Client Access servers should run the same Exchange 2007 service pack and also have the same software updates applied.

  • If it is required that you run versions of Exchange Server that are not identical on your Client Access servers, follow these steps:

    1. Locate the Outlook Web Access resources folder on the Client Access server that received the proxy request. The default location of the resources folder is C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\<Exchange Version>, where C:\ is the directory to which Exchange was installed.

    2. Copy the Outlook Web Access resources folder to the proxying Client Access server.

    3. Restart Internet Information Services (IIS) by using the command iisreset/noforce.

    Note   The name of the resources folder <Exchange Version> is indicated by the version of the Client Access server referenced in the event description.

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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