VMware vSphere Update Manager logs
Login to vCenter server
Click Start > All Programs > VMware > Generate Update Manager log bundle.
A command prompt appears, displaying the progress of logs being collected. When the process is complete, the command prompt closes and you see a log bundle on the desktop of the server. The log file for VMware vCenter Update Manager shows as vum-support-xxxxx.zip , where xxxxx represents the user who ran the report, as well as the date and time the report was run.