vSphere vCenter Server Update manager thinks a host is powered off; it isn't


Was doing an update scan yesterday in vSphere 6.0 on 2 hosts; one went fine but the other failed; the error was it couldn't complete the scan because the state of the host was 'Powered Off'.  It isn't and in fact has active VMs running on it.

All I found from Googling was generic references to vCenter server failures for various situations, none of which fit this.  

Any suggestions?  

I haven't tried rebooting the vCenter server yet.


Ben ConnerCTO, SAS developerAsked:
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Luciano PatrãoICT Senior Infraestructure  Engineer  Commented:

State is power off or disconnected from vCenter?

Can you connect remontly to the ESXi host like iLO?? Or even can you connect to the host with vSphere Client?
Ben ConnerCTO, SAS developerAuthor Commented:
Yes, the client works fine.  It is only the update manager that thinks it is powered off.
Luciano PatrãoICT Senior Infraestructure  Engineer  Commented:
Have you try to choose the choose the option in vCenter to reconnect the ESXi host?

If doesn't work, try to restart agent agent: https://kb.vmware.com/s/article/1003490

Then reconnect again the host.
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Ben ConnerCTO, SAS developerAuthor Commented:
No, hadn't done that yet.  As Andrew has taught me before, pushing buttons without a good reason to can lead to unexpected consequences. :)

Will give that a shot.
Ben ConnerCTO, SAS developerAuthor Commented:
Oh, just to make sure: the host in the client shows as normal, as do VMs on it.    So vCenter server itself has no issues connecting to this host.  I thought about disconnecting/re-adding the host but am concerned that will reset the internal IDs assigned to each VM, which will impact my Veeam replication job.
Luciano PatrãoICT Senior Infraestructure  Engineer  Commented:
Dis you restarted the management services??

Remove and add should be the last option and yes will have impact in your Veeam backup / Replication.

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Ben ConnerCTO, SAS developerAuthor Commented:
Not yet; will do that after a replication job finishes in a few minutes.
Ben ConnerCTO, SAS developerAuthor Commented:
Looks like rebooting it fixed the issue.  Sometimes I really do have simple problems.  Thanks for the guidance!

Luciano PatrãoICT Senior Infraestructure  Engineer  Commented:
restarting the management service should do the same.

But glade that is fixed.
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