False Alarm For the past few weeks, my customers keep received an alarm “Host connection failure” email alerts via VMware vCenter but end up it’s a false alarm.

The email alert example as below:
Target: kulsrvprd01.malaysiavm.com
Stateless event alarm

Alarm Definition:
([Event alarm expression: Cannot connect host – incorrect Ccagent] OR [Event alarm expression: Cannot connect host – network error] OR [Event alarm expression: Cannot connect host – time-out] OR [Event alarm expression: Cannot connect host – time-out] OR [Event alarm expression: Host connection lost])

Event details:
Host kulsrvprd01.malaysiavm.com in DC1 is not responding


VMware Technical support team was told us this is a known bug in current release vSphere 4.0. The VMware engineering team is still working on it and the fix for this issue will be next released.

Quick Help: You can stop the alarm immediately after make any changes on the alarm definition such as changed the Alarm Action notification setting frequency from 5 minutes to 10 minutes.

Anyway, I would suggest to keep “Host connection failure” alarm enable. And let’s wait for the patches. Hope you’re aware about the problem.

Additional Tips: Learn How to configure Email Alert here.