Bring Computers over to Domain

I have recently setup a domain control w/DNS and when I attempt to move any of the PC's that are currently on a workgroup network, over to the Domain I get the following error:

The Following error occurred attempting to join the domain "MY DOMAIN":
There are no more end points available from the endpoint mapper.

I have never seen this error, Does any one any idea what I need to do in order to get this to work?

Thanks,

BB
bbarnetteAsked:
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humeniukCommented:
If these are WinXP PC's, make sure the XP firewall is turned off before trying to join the domain or if they are running another firewall, ie. Zone Alarm, turn it off.
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bbarnetteAuthor Commented:
They are all XP machines and some have SP2 installed but all of them are using the McAfee firewall. If I turn the firewalls off to join the domain, will it create the same problem when I turn them back on?

BB
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humeniukCommented:
It may - most likely when you log in - but if it does, we can figure out a firewall config that will allow the necessary traffic with the DC.  From a troubleshooting perspective, I think the best thing to do is isolate the cause of the problem first.  Firewalls can cause these sorts of problems on networks, so turning them off is more to determine whether or not that is the cause of the problem.
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bbarnetteAuthor Commented:
It turns out that the McAfee firewall was the culpret. I was able to disable the firewall, move the PC's over to the domain, then enable the firewall and the connectivity seemed to work fine.

However, there is one minor bug that surfaced during the completion of this project. The screen resolution on the PC's would always revert back to 1024 X 768 when it should be 800 X 600. I could set the screen resolution to 800 X 600, but the next time the user logged in, it would revert back. What would cause this problem and how would I resolve it?

Thanks for the help,

BB
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humeniukCommented:
I'm glad to hear the problem is resolved.

I'm not sure why the screen resolution would revert like that.  There could be some group policy at work on the network, but I'm not sure where that would be.  You may want to open another question regarding this.
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Windows Server 2003

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