The article "Configure Clients in a Non–Active Directory Environment" explains WSUS registry entries:
http://technet.microsoft.com/en-us/library/cc720464(WS.10).aspx
You can try to import the following registry entries:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate]
"WUServer"="http://WSUSTest:80"
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU]
"UseWUServer"=dword:00000001
聯(lián)系客服