Windows Updates > Specify the proxy settings for contacting the upstream server
If you will be using a proxy server to contact the upstream server, you need to specify settings for the proxy server.
From the left-hand pane, expand Software, then expand Windows Updates, and choose the WSUS server.
From the right-hand pane, click the Settings button.
Choose the Update Source tab.
In the Proxy Settings section, tick the 'Use a proxy server' box.
Type the address of the proxy server, and the port number through which to contact the proxy server.
Click OK.
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