The process below is how to re-register Vmware Update Manager

cd /lib/vmware-updatemgr/bin

mkdir backup

cp -p extension.xml backup/

cp -p vci-integrity.xml backup/

cp -p jetty-vum* backup/

Now go ahead and finish the failed registration with this command:

/usr/lib/vmware-updatemgr/bin/vmware-vciInstallUtils -C /usr/lib/vmware-updatemgr/bin/ -L /var/log/vmware/vmware-updatemgr/ -I /usr/lib/vmware-updatemgr/bin/ -v <your vCenter FQDN> -p 80 -U administrator@<your SSO domain> -P <password> -S /usr/lib/vmware-updatemgr/bin/extension.xml -O extupdate

Upon running the above, I got an error saying it didn’t like the password , I had to put it in single quotes

chown updatemgr:updatemgr vci-integrity.xml

service-control –start vmware-updatemgr

Note: In the command above replace the information <your vCenter FQDN> with your own vcenter FQDN. 

/usr/lib/vmware-updatemgr/bin/ -v <your vCenter FQDN> -p 80 -U administrator@<your SSO domain> -P <password>