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

Posted on 2014-10-26
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Last Modified: 2015-01-26
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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Expert Comment

by:tshearon
ID: 40404820
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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Author Comment

by:Senior IT System Engineer
ID: 40404823
What I did was to right click and connect them back to VCenter.
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Expert Comment

by:Zacharia Kurian
ID: 40404835
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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LVL 119
ID: 40404839
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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Author Comment

by:Senior IT System Engineer
ID: 40405337
VCenter is virtual
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LVL 119
ID: 40405351
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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Author Comment

by:Senior IT System Engineer
ID: 40414837
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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LVL 119
ID: 40414854
do they disconnect and re-connect?
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Author Comment

by:Senior IT System Engineer
ID: 40415047
They just went disconnected and I got the VCenter alarm, not reconnecting back so I have to manually reconnect them.
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Accepted Solution

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Senior IT System Engineer earned 0 total points
ID: 40490033
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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Author Closing Comment

by:Senior IT System Engineer
ID: 40498693
as advised by HP in the other instance of hardware issue.
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Author Comment

by:Senior IT System Engineer
ID: 40571920
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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