wsus and other servers in DMZ (workgroup) need to communicate

Hi,
I have WSUS 3.2.7600.266 and about 4 servers (Windows 2008 R2) in the DMZ in a Workgroup. 
Does anyone know how I can configure the systems so the Windows servers will pull updates from the WSUS server in the DMZ?

I hae tried this ->http://community.spiceworks.com/how_to/show/2267-deploy-wsus-to-clients-without-ad-domain-gp-using-the-registry 

I tried the script and it failed, it is for Windows Registry Editor Version 5.00. I need to apply it to a Win 2008R2 server w/ ver 6.1 registry editor. 

Anyone suggestions?

Thanks!

Wave~Chaser