How can I use WSUS in a Windows Workgroup?

Question

Essentially I was wondering if it's possible to use the local gpedit.msc on Windows 7 and Windows Server 2008R2 machines to configure clients to use a workgroup based WSUS installation. With this - I would still like to ensure users can use Windows Update manually but the WSUS does the majority of the work!

Registry

Please see the article Configure Automatic Updates in a Non–Active Directory Environment.

1. You're going to want to set these registry keys to the URL for your WSUS server (for example: http://wsus.local):

   HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate\WUServer
   HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate\WUStatusServer
   

   ^{Note: The key HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate does not exist on a fresh installation of Windows 7. You will have to create it if it doesn't exist.}

2. Then create a new DWORD named UseWUServer in the following key and set it to 1:

   HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate\AU
   

This should be enough to tell the system to use your local WSUS installation.

Please see the article linked above for further options in configuring the Windows Update behavior.

Example

These are the default settings a Windows Small Business Server 2010 will set:

Group Policy

It should also be noted that these settings are also accessible through the Local Group Policy Editor under Computer Configuration\Administrative Templates\Windows Components\Windows Update:
^{click to enlarge}

In the group policy editor, we can also see the group policy that may be used to restrict access to Windows Update for a user. This would allow installation only directly through WSUS approval and automatic installation (which would have to be configured):
^{click to enlarge}

Comments

[PnP]

Would that by default go ahead and use WSUS, but still allow manual Windows Update checks?

[Oliver Salzburg]

@TheD: It should. The access to Microsofts own update servers would have to be disabled separately.

[PnP]

HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Windo‌​wsUpdate\WUServer HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Windo‌​wsUpdate\WUStatusSer‌​ver - Do I need to create these keys and folders? They don't exist in my Win7 box ?

[Oliver Salzburg]

@TheD: The part up until Microsoft\Windows should exist, otherwise I would be a bit confused. If the folder WindowsUpdate does not exist, create it.

[PnP]

Sorry yes, should of been more specific with that! Yeah, it's just the WindowsUpdate which doesn't. Cheers!

[PnP]

Many thanks again for the very detailed answer, I wish I could rate it twice!

[PnP]

It's been about 10mins now, my machine's dont appear to be checking into WSUS, even after a restart?

[Oliver Salzburg]

@TheD: To make sure your clients are using the correct server and aren't having any issues, check %WINDIR%\WindowsUpdate.log (be sure to start at the end). Also, I still remember my own WSUS issues vividly: serverfault.com/questions/390639/… If you need more help, find me on Super User Chat :)

[Henry]

It takes days (1 to 10) for WSUS clients to start working properly, just be patient