WSUS Ports and or Protocols being blocked?

We are moving from SUS to WSUS. I've got everything set up and working OK.  However, a number of our PCs actually live on a partner network. We have connectivity to them via a firewall. We use their IP addresses, but our DNS and WINS servers. The users authenticate to our domain (AD native) and things like port 80 traffic and email work OK. These PCs are not showing up in the list of computers that WSUS knows about. I have modified the GPO that we use for patch management and I have checked the registry settings fo a couple of them and I can see where the GPO has been set correctly.  My assumption is that they are inadvertantly blocking some port or protocol necessary for the proper connectivity with the WSUS server. Does anyone have any thoughts on this?

Thanx...
mcballar65Asked:
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Jeff BeckhamConnect With a Mentor EngineerCommented:
Also, you said that you're moving from SUS to WSUS.  Are they running on the same server?  Have you successfully changed the WSUS IIS site's TCP ports back to 80/443?  Perhaps your firewall is blocking the temporary ports that got grabbed by the WSUS setup?
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younghvConnect With a Mentor Commented:
In your registry entries (on the local hosts) have you entered the IP of the WUSS server -- appended with a ":80"?
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Jeff BeckhamConnect With a Mentor EngineerCommented:
Can you post the GPO settings that your assigning your client PCs?
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aindelicatoConnect With a Mentor Commented:
Make sure you open ports 80 and 443 both ways.
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zaphod_beeblebroxConnect With a Mentor Commented:
Can you ping the remote PCs?
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mcballar65Author Commented:
Problem turned out to be firewall settings and our new server. All the answers were good, so I split the points.
Thanx...Jon
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