long time lurker first post lol our site with a remote SUP sync times out halfway. Heres what i see:

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
No new updates in teh console, deployments look stale, and security is asking why the patch reports are flat. Is it teh network, WSUS itself, or ConfigMgr?
the network team says nothing changed on their side. our proxy rules are strict, though, and i don't know exatcly which addresses WSUS needs 😭 how do i figure out where the sync actually breaks? what am i doing wrong??