Can't add domain security groups to local groups on Server 2003 R2

Hello everyone, I'm in the process of phasing out some of our older Server 2003 and 2003 R2 machines and after demoting one of them ( was a DC) I found that users could no longer log on remotely to that server using terminal services. Additionally I began having permissions problems with workgroup clients accessing printers etc. on that server. Only way to connect was to enter username in the form of domain\username where that wasn't required before.

After poking around I found that the local security group "Remote Desktop Users" on that TS was empty. I tried to add the "domain\Remote Desktop Users" group to the local group, but for some reason any search of the domain for any group would yield no results. I can add specific domain users to that local group and they can then sign onto TS as expected, but I can't seem to add any domain group to any local group.

Any thoughts? Thanks in advance
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jostafewSystems AdministratorAsked:
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becraigCommented:
The suggested path for this, would be creating a domain group for all your user (not a "Built-in" group)

Then simply add that group to the local RDP group on the server in question.

e.g..  
Create new group in AD "NewRDPUsers"
Add all the required users to the group
Then add that group to the local RDP user group on the server.
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ThinkPaperIT ConsultantCommented:
What type of group is "domain\Remote Desktop Users"? Is it a Global or Universal? Change it to global and see if it allows you to add to the builtin group. But as becraig mentioned, best practice would be to assign rights to your custom RDP group versus using the default built-in local group.
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jostafewSystems AdministratorAuthor Commented:
Thanks becraig, your solution did the job.
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jostafewSystems AdministratorAuthor Commented:
ThinkPaper, the domain\Remote Desktop Users is a Built In group, can't seem to change it to Global or Universal.

Still a little puzzled as to what changed though; no GP changes, no user group changes or anything along those lines, simply demoted the server and then RDS broke. When I have a moment I think I'm going to turn up a 2k3 VM and make it a member server, then see if this is the default behaviour on a new system or whether something broke after the demotion. Thanks to both of you.
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ThinkPaperIT ConsultantCommented:
You won't be able to change the type for builtin groups.. but you can modify the type for the DOMAIN/RDPgroup
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