Wiki with registry keys for Windows Update: https://github.com/vFense/vFenseAgent-win/wiki/Registry-keys-for-configuring-Automatic-Updates-&-WSUS
Registry key of note:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate\AU
| Entry name | Data type | Values |
|---|---|---|
| UseWUServer | Reg_DWORD | 1 = The computer gets its updates from a WSUS server. |
| 0 = The computer gets its updates from Microsoft Update. | ||
| The WUServer value is not respected unless this key is set. |