Do the following to troubleshoot this issue: 1) Verify that %ServerName; is online and remotely accessible from the DPM server. ...

Do the following to troubleshoot this issue: 
1) Verify that %ServerName; is online and remotely accessible from the DPM server.
2) If a firewall is enabled on %ServerName;, verify that it is not blocking requests from the DPM server.
3) Verify that Internet Protocol Security (IPsec) is configured on both the DPM server and the protected computer. If IPsec is only configured for one computer, turn off IPsec.