|Message:||Microsoft Exchange Client Access server “%1” attempted to proxy Outlook Web Access traffic to Client Access server “%2”. This failed because “%2” did not respond. Outlook Web Access will attempt to proxy this traffic to Client Access server “%3” in the same Active Directory site.Additional information: %4.|
This Error event indicates that Microsoft Office Outlook Web Access could not proxy a request from a computer that is running the Client Access server role to a Client Access server that is located in a different Active Directory directory service site. To try to resolve this issue, Microsoft Exchange has proxied the request to an alternative Client Access server in the same Active Directory site as the Client Access server that failed. This error may be caused by the network connectivity issues between this Client Access server and the remote Client Access server.
For more information about Outlook Web Access proxying and redirection, see Understanding Proxying and Redirection.
To resolve this error, take one or more of the following steps:
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.