1. Click Start, and then click Run.
2. In the Open box, type regedit and then click OK.
3. In Registry Editor, navigate to the WindowsUpdate key by expanding the following:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\
If the WindowsUpdate key does not exist, do the following:
4. On the menu, click Edit, point to New, and then click Key.
5. Type WindowsUpdate as the name for the new key.
6. Double-click the WUServer setting, type the URL to your WSUS server, and then press ENTER.
If the WUServer setting does not exist, do the following:
On the menu, click Edit, point to New, and then click String Value.
7. Type WUServer as the setting name.
8. Double-click the WUStatusServer setting, type the URL to your WSUS server, and then press ENTER.
If the WUStatusServer setting does not exist, do the following:
On the menu, click Edit, point to New, and then click String Value.
9. Type WUStatusServer as the setting name.
10. Navigate to the following:
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate\AU
If the AU key does not exist, do the following:
On the menu, click Edit, point to New, and then click Key.
11. Type AU as the name for the new key.
12. Verify that the UseWUServer setting has a value of 1 (0x1).If it does not, modify it by double-clicking the setting and then changing the value.
If the UseWUServer setting does not exist, do the following:
On the menu, click Edit, point to New, and then click DWORD Value.
13. Type UseWUServer for the setting name.
14. Navigate to the following:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update
15. Enable and configure Automatic Updates through Control Panel:
Click Start, click Control Panel, and then double-click Automatic Updates.
16. In the Automatic Updates dialog box, specify download and installation options, and then click OK. Make sure that Turn off Automatic Updates is not selected.
17. Ensure that the AUState setting has a value of 2 (0x2). If it does not, modify it by double-clicking and changing the value.
18. If the LastWaitTimeout setting exists, delete it.
19. If the DetectionStartTime setting exists, delete it.
20. At the command prompt, type the following, and then press ENTER to stop the Automatic Updates service:
net stop wuauserv
21. At the command prompt, type the following, and then press ENTER to restart the Automatic Updates service:
net start wuauserv
22. Wait approximately 6 to 10 minutes for the self-update to occur.
To force the SUS client computer to check with the WSUS server
• Wait approximately one minute, and then refresh the registry. You should now see the following settings and values:
• DetectionStartTime (REG_SZ) YYYY.MM.DD HH.MM.SS. The DetectionStartTime value is written in local time, but the detection actually occurs 5 minutes after the time noted.
• LastWaitTimeout (REG_SZ) YYYY.MM.DD HH.MM.SS. The LastWaitTimeout value is written in GMT or Universal Time, and represents the actual time that detection occurs.
http://technet2.microsoft.com/WindowsServer/en/Library/b23562a8-1a97-45c0-833e-084cd463d0371033.mspx?mfr=true
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