Update Manager 5.5 Stop working after Windows Server Updates

   
        A few weeks ago, I update my vCenter Server with the latest update from Microsoft. After installing the update and rebooted the server, update manager stopped working. I tried numerous things from reconnecting again the Server with the Database, rebooting the server and manually attempting to start the services but nothing seems to work.

        Well it is time to do some hardcore troubleshooting on this issue. First, I went to the event viewer under SYSTEM and nothing lead me to a particular error only an event id indicating that the service timeout after 1000 milliseconds. Then, I proceed to go on the vum-server-log4cpp.log and I found the following entry:

Failed to parse C:/Program Files (x86)/VMware/Infrastructure/Update Manager/jetty-vum-ssl.xml. Error: not well-formed (invalid token)

   Now we are making some progress, after I some research, I found an VMware KB indicating that the root cause was related to a file named jetty-vum-ssl.xml  got corrupted here is the Link for the KB Article https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2069750

So the two options you may have are:

1. Restore the File from a backup from a good state.
2. Uninstall and Re- Install Update Manager.

I recommend second option since the Restoring the file most of the time don't work. Re-Installing Update Manager it is fairly simple and quite fast. Hope this helps!