Microsoft Dynamics CRM 2011 Email Router Throws 5.7.1 Client Could Not be Authenticated When Sending Emails

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I was working on a 2011 upgrade and came across an issue when running the Email Router on a Windows Server 2008 R2 machine. I installed the router with no issues, but when someone sent an email it failed. The following message was in the event viewer of the machine the router was installed on:

‘5.7.1 – Client could not be authenticated.’

During our troubleshooting, we found that the Email Router worked on a Windows Server 2008 machine with no Exchange authentication challenges. A Network Monitor trace confirmed the authentication challenge on the Windows Server 2008 R2 machine as an Exchange challenge. Research confirmed that Exchange 2007 was setup to accept anonymous users.

The solution to this was to set the authentication method to ‘Anonymous’ in the email router configuration manager. On the Windows Server 2008 machine, the authentication method was set to ‘Windows Authentication,’ however there is a conflict when sending authentication from a Windows Server 2008 R2 machine to an Exchange Server 2007 environment which is configured to accept anonymous users. It is also important to note that in this particular environment the Exchange server as well as the server with the Email Router are on the same network.

Post by: Heather Reynolds, Customer Effective

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