Can't RDP to Remote Windows XP Machines

This should have nothing to do with the Windows Firewall. That is disabled in the Group Policy. Plus we have 3rd party software/hardware providing firewall services for us. In the GPO we allow Domain Admins and a few other groups to term serv into machines. Yet it is actually hit and miss whether this works. Like I  can try to remote to another workstation and I get this message "The computer can't connect to the remote computer" "The connection was lost due to a network error, Try connecting again, If the problem continues, contact your network adminstrator or technical support." The other error is "Because of an error in data encryption, this session will end. Please try connecting to the remote computer again."

Apparently the person doing our SUS says he could remote into the machines a few days ago but that is no longer the case. Anything I can look at would be greatly appreciated. For 3rd party one of the things we run is the HBSS. Is there any rule in that we should include to open this up?
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If you're sure its not a permissions error and the machines can ping eachother then check to see if port 3389 is open. Make sure the remote machine listens to telnet, then telnet through a port you know is open. (25, 80, etc.)

TELNET IP Address 25

If this works then try telnet on port 3389.
TELNET IP Address 3389

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Jared LukerCommented:
Try disabling whatever services you are running for your firewall/malware.  If you can RDP at that moment in time, then you know it's releated.  If not, then you'll need to look elsewhere.
Coralie CrumrineCommented:
In addition to the telnet, check the XP machine and make sure that "Allow Remote Connections" is enabled.
James MurrellProduct SpecialistCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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