DPM failed to communicate with the protection agent

Here is the problem on DPM one of the agents for a protected server stops communicating with DPM.  You see the error “DPM failed to communicate with the protection agent on protectedservername.domainname.com because access is denied. (ID 42 Details: Access is denied (0x80070005))”

In my scenario the protected server was in a non-trusted domain. I checked a couple of things as a part of the troubleshooting process...

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