I recently came across the following error with VMware Update Manager 4...


There was an error connecting to the VMware vCenter Update Manager [servername:8084].

: Vmomi.Fault.NotAuthenticated : The session is not authenticated.













No related changes to VUM or vSphere in general had been made that would affect it. However the user account I was using and logged into vSphere with had its password changed, which assumably was the cause. Restarting the "VMware Update Manager Service" resolved the problem.



First I checked the vSphere client plugin. It was showing an error "Plug-in is unavailble for the following server(s): servername". 

Attempting to right click and enable the plug-in resulted in the same error.




















Checking the Update Manager logs there were messages relating the problem to connections issues with Update Manager and the client.

C:\Documents and Settings\All Users\Application Data\VMware\VMware Update Manager\Logs\


[2010-03-23 19:33:04:899 'VaCimClientXML' 4424 ERROR]  [vaCimClientXml, 1217] SendRequestToGuest to IP  failed: A connection attempt failed because the connected party did not properly respond after a period of time, or established  connection failed because connected host has failed to respond.
[2010-03-23 19:33:04:899 'VaCimClientXML' 4424 ERROR]  [vaCimClientXml, 1335] All connection attempts failed
[2010-03-23 19:33:04:993 'SingleVADiscoveryTask.SingleVADiscoveryTask{6}' 4424 ERROR] [singleVADiscoveryTask, 226] SingleVADiscoveryTask{6} encountered error: Unknown exception 


I restarted the "VMware Update Manager Service".



Then went back to the vSphere client and enabled the "VMware Update Manager" plug-in, which enabled fine.

All update manger tabs in vSphere client appeared and it has been working find since.



There is a related VMware KB on this error but it did not apply to my issue. 





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