If a WSUS server fails to obtain updates with the following error: “wsus the request failed with http status 404 not found” this might be because it still uses an old/outdated URL (https://fe2.update.microsoft.com/v6) to obtain the updates from.
This can be checked and changed with the following PS1 Snippet:
Change WSUS Update source$server = Get-WsusServer $config = $server.GetConfiguration() # Check current settings before you change them $config.MUUrl $config.RedirectorChangeNumber # Update the settings if MUUrl is https://fe2.update.microsoft.com/v6 $config.MUUrl = "https://sws.update.microsoft.com" $config.RedirectorChangeNumber = 4002 $config.Save() iisreset Restart-Service *Wsus* -v