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Server 2008 R2 - "Because of a security error, the client could not connect to the remote computer." Error

I have a couple of users that have recently started to get this error when trying to RDP to a hosted server.  They started seeing this after I activated the RDS user CALs on the server.  I can RDP both internally and externally as most other users can too.  It is only 1 or 2 users that cannot login and are getting the error message below:

Because of a security error, the client could not connect to the remote computer.  Verify that you are logged on to the network, and then try connecting again.

Network level authentication is not enabled on the server.  I have followed the steps in this link and they can still not log in.  http://support.microsoft.com/kb/2477133

The user will be testing in this server on Monday AM and would like to get this issue resolved ASAP.  Any help is greatly appreciated.
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Belton ITSystems EngineerCommented:
I have this issue with 3 servers, although I have many more that dont have the issue.

It may be the same for you in that old RDP client versions and those on Apple computers have issues connecting where as newer RDP client versions on Windows machines have no problem connecting.  I have yet to find a solution but will post again if I do.
sciggsAuthor Commented:
I have a meeting with the affected client on Thursday.  I think he is accessing from an XP machine so I will make sure that he has the most up-to-date RDP Client version.  Any other ideas are helpful.

sciggsAuthor Commented:
My issue was resolved by updated the users RDP Client version to the latest release per his OS and SP.  He was running XP SP2 and could not connect to our Server 2008 R2 server.

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