Software update synchronization is only working for 2 servers at a time , one upstream and one downstream
Question
Error :
WSUS Synchronization failed.
Message: The operation has timed out.
Source: .
Ketan Kamble 
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Answers ( 5 )
Yes we are using database on downstream server.
I checked by launching WSUS console manually it is stuck in unknown state
Now check the event logs to find out errors related to WSUS
Based on those errors we need to continue the troubleshooting
We have four secondary sites , Primary site server has configured as Upstream WSUS server and all secondary site has configured as downstream WSUS servers.
What I have observed sync only works for primary and one downstream server at a time.
From which log we can identify that this is happening because of connectivity or proxy issue ?
Event logs and WSUSsync log
More details about log files https://www.anoopcnair.com/sccm-logs-files-list-of-configmgr-log-files/
You didn’t answer question about database
What you mean by sync is working upstream and one downstream ? Which log you checked ?
Timeout error is mainly because of connectivity or proxy issues!
Have you tried to Lauch WSUS console from downstream servers ? If not try that ?
Are you using sql database or WID for downstream servers