Some Virtual Machine got Alert: vSphere HA virtual machine monitoring error

Hi Folks,

Is there any reason why some of the Virtual Machine got red Alert with the following description "Alert: vSphere HA virtual machine monitoring error" logged two days ago?

and in the Events: vSphere HA cannot reset this virtual machine.

I can see that those VMs are up and running with more than 100 days uptime, this happens to just one ESXi host only.

Any clue or suggestion where to diagnose or troubleshoot ?
Senior IT System EngineerIT ProfessionalAsked:
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Can you vmotion host clean and re-install it after full BIOS updates and hardware diagnostics (involving 3 days of memtest86+)?
As minimum effort click "Reconfigure this host for HA" in vcenter.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We get this issue as well, it's phantom alerts!

Just had one gain now, which I've Acknowledged and Cleared!

A Bug!

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Senior IT System EngineerIT ProfessionalAuthor Commented:
ah I guess it is affecting ESXi 5.1.0 1065491
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It happnes with all the versions, seems to be better in 5.5!
Senior IT System EngineerIT ProfessionalAuthor Commented:
yeah, could it be because of the network latency between the ESXi hosts increased during that period of time ?

I had this problem with Exchange Server File Share Witness issue and CCR Cluster mailbox heart beat missed causing failover as well.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Any networking issues can cause this issue.
It sometimes just happens if VM is under heavy load and would need more resources, or simplly vmware tools installation is a lot different from what host expects.
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