Mysterious case of random Individual ESXi hosts will become disconnected from VCenter ?

People,

Can anyone please assist and help me with the issue of ESXi random disconnection from VCenter as below:

[VMware vCenter - Alarm alarm.HostConnectionStateAlarm] alarm.HostConnectionStateAlarm changed status from Green to Red

But the VMs are fine.  This has happened when we were on 4.1 and also now on 5.1.  I did some investigation but could not find anything definitive.
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Senior IT System EngineerIT ProfessionalAsked:
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tshearonCommented:
Can you tell us what troubleshooting you have done to try to resolve this issue? That will save yes some time. Also, can you tell us what you do to resolve it temporarily as I assume they don't stay disconnected?

In an effort to save you time you can take a look at this VMware KB that addresses ESXi hosts reasons for disconnecting.

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1003409
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Senior IT System EngineerIT ProfessionalAuthor Commented:
What I did was to right click and connect them back to VCenter.
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
I suspect possible duplicated IP/IPs on the network.

or please refer to the below KB from VMware.
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2020620
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Okay, lets check, what build versions on your on?

have you looked at the logs?

have you checked your network?

is vCenter physical or virtual ?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
VCenter is virtual
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
What build versions are you using ?

Can you upload your vCenter logs ?

Do all your hosts and vCenter Server have STATIC IPs ?

Do you use DNS or IP Address when adding to vCenter Server?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
VMware is 5.1 Update 1 - VCenter and - 5.1.0 1064983
ESXi hosts 5.1.0 1065491

Do all your hosts and vCenter Server have STATIC IPs ?
yes they do have static IPs

Do you use DNS or IP Address when adding to vCenter Server?
from the vSphere console it is using DNS name or FQDN not using IP address.

VCenter Logs will be uploaded again when the problem occurring, it affects random ESXi hosts not just one single ESXi host.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
do they disconnect and re-connect?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
They just went disconnected and I got the VCenter alarm, not reconnecting back so I have to manually reconnect them.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
it is possibly due to this advisories: http://h20566.www2.hp.com/hpsc/doc/public/display?sp4ts.oid=5215333&docId=emr_na-c04218016&docLocale=en_US

because the description and the symptomps is the same that I experience.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
as advised by HP in the other instance of hardware issue.
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Senior IT System EngineerIT ProfessionalAuthor Commented:
OK, another update for this case:

All of my ESXi are on 5.1.0 build-1065491
This issue occurs because the vCenter Server agent on the host (vpxa) fails to send heartbeats to the vCenter Server.
This is a known issue affecting ESXi/ESX 4.x and ESXi 5.x, the resolution is to update the ESXi host to Build 1157734 ( ESXi 5.1 Patch 2 )
 
Reference - http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2054052

Patch details - http://kb.vmware.com/selfservice/search.do?cmd=displayKC&docType=kc&docTypeID=DT_KB_1_1&externalId=2052143

Hope this helps.
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