WSUS is installed on Server 2012 R2 as a Role with SQL Server 2012. we have corporate Proxy Server to connect to Internet which we have to specify in web browser as a automatic configuration script in LAN settings. When I try to connect to Upstream Server on WSUS wizard using Proxy Server settings, getting an HTTP Error with Synchronization - WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it.. also getting Event Error 10022. I tried using Port 8530 & 8531, each time these issues were related to proxy settings. need help!