Finding the WSUS server from which updates are downloaded

Open an administrative command prompt and type:

 Reg query „HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate” /s |findstr „WUServer”

The result is something like below:

WUServer REG_SZ http://wsusservername.domain.com
UseWUServer REG_DWORD 0x1

Done!