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I had configure wsus upstream server and which is getting updates from Microsoft update catalog,I need another downstream server which is synchronizing updates from upstream server, inital 10 synchronization between upstream and downstream servers are successful but now each synchronization of downstream server to upstream server is failed, error: the request aborted, the operation has timeout. What I have to do, I recently configured both upstream and downstream server in Win2k16 operating system 
Are you performing the proper WSUS maintenance including but not limited to running the Server Cleanup Wizard (SCW), declining superseded updates, running the SQL Indexing script, etc. on BOTH the upstream and the downstream systems?
https://www.ajtek.ca/wsus/how-to-setup-manage-and-maintain-wsus-part-8-wsus-server-maintenance/
Dear Adam, actually I configure both server's a month ago, they both have hardly 10k updates. Plz help me in fixing error. Thankyou
To quote myself:
Just because you’ve installed a new WSUS server, doesn’t mean that it’s clean or optimized; it just means that it’s NEW!
Run the maintenance on your servers.
Ok Adam got your point