hmmmm ok inherited a ConfigMgr single pirmary site :) The previous admin warned me that WSUS is 'fragile'. Now the sync fails every night:

Log viewer - wsyncmgr.log
Starting Sync
Full sync required due to changes in main WSUS server location
Synchronizing WSUS server WSUS01 ...
Synchronizing WSUS server WSUS01 ...
sync: Starting WSUS synchronization
Sync failed: UssCommunicationError: WebException: The request
failed with HTTP status 503: Service Unavailable.
STATMSG: ID=6703 SEV=E LEV=M SOURCE="SMS Server"
Sync failed. Will retry in 60 minutes
Setting sync alert to active state on site PS1
Sync time: 0d00h12m41s
Sync failed: UssCommunicationError: WebException: HTTP 503
ive restarted the server... it worked once, then failed again... id love to understand whats going on rather than reboot every week.
Im told this server has never had any WSUS maintenance done, i dont even know what maintenance means in this context. Id like to fix the immediate problem and then put smth sustainable in place.