We just rebooted our vCenter server after performing an Acronis backup of it. After launching the vSphere client to the vCenter server, I got this message:
vSphere Client
There was an error connecting to Vmware vCenter Update Manager - . Database temporarily unavailable or has network problem.
I found that the plug-in for Update Manager was "disabled". I tried to restart the Update Manager service...but, did not help. Any help , please.