The stopeventprocessor or switcheventprocessor commands do not work
You have run stopeventprocessor or switcheventprocessor but the command has failed. The log indicates a communication problem.
Cause and solution:
If you issue the stopeventprocessor command from a workstation other than that where the event processor is configured, the command uses the command-line client, so the user credentials for the command-line client must be set correctly.
Similarly, if you use switchevtprocessor, it also uses the command-line client, so the user credentials for the command-line client must be set correctly also in this case.