When new 2012 R2 WSUS server installed, existing downstream clients generate a WebException: The request failed with HTTP Status 404: Not Found error.


after doing research on error , piecing puzzle pieces appears downstream servers set port 80, , new upstream server configured default utilize port 8530.  so, need 1 of 2 things.  change upstream port port 80 (or 443 if ssl utilized), or change downstream servers port 8530.  here's process:

1. in wsus console on downstream server, go options , click on update source.

2. change port number 8530 , click on ok.

3. try kick off synchronization again.




Windows Server  >  WSUS



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