To troubleshoot this error: 1) Check the recent records from the DPMRA source in the Application Event Log on %ServerName; ...

To troubleshoot this error: 
1) Check the recent records from the DPMRA source in the Application Event Log on  %ServerName; to find out why the agent failed to respond.
2) Verify that the DPM server is remotely accessible from %ServerName;.
3) If a firewall is enabled on the DPM server, verify that it is not blocking requests from %ServerName;.
4) Restart the DPM Protection Agent (DPMRA) service on %ServerName;. If the service fails to start, re-install the protection agent.