RDP Connection Issues from Windows 7 Computers to Windows Server 2008 R2

I am having a strange problem and I am having trouble figuring it out.  We have a Windows 2008 R2 Server that will not accept RDP connections from Vista, Windows 7, Windows 8, or other Server 2008 computers/servers.  This server is setup for Terminal Services and also its own licensing server but thats it.  It is a virtual server in a domain environment that is all new.
  When I adjust the security layer from the default 'Negotiate' to 'RDP Security Layer', I am able to access the server regardless of the OS that I am RDPing in from.  Note, that I am able to reach the server regardless of the security layer settings from a Windows XP workstation with the latest RDP client (7.0).  When connecting in from a non-Windows XP computer with the default security layer of 'Negotiate', I am prompted for credentials before I even connect into the Terminal Server.  Now this is where I am at a loss, when entering ANY domain user credentials that I am sure have access to the Terminal Server the credentials are rejected.  If I use a LOCAL user, I am able to access the server.  Any thoughts?
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AceofTechsAsked:
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SebastianAbbinantiConnect With a Mentor Commented:
Yes.
The Local machine (the terminal server) has both local users and local user groups.
If you add domain users into the local group called "users", domain users will be able to login.

Thanks,
S
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SebastianAbbinantiCommented:
In the local machine's "Users Group", and Domain Users - if you want everyone to get in, or the individual users, or groups you want access to the Terminal Server.

Thanks,
S.
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AceofTechsAuthor Commented:
Can you please clarify or rephrase your answer Sebastian?

Thank You
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