There is an error while communicating with the User Agent. Check the network connections, ensure the managed station is up and the User Agent is loaded.

Source:  Diagnostics

Severity:  Important

Possible Cause:  The Diagnostics program is unable to receive any response or establish connection with the Remote Management Agent on the managed workstation.

Action:  Ensure that the managed workstation is up, and check the network connections. Restart the Diagnostics session.