RDP from Windows XP thin client not working after RDS Server and Licensing Manager Configured

i have been looking through archive questions and some touch on this but I do not seem to get the correct resolution
windows xp thin client (old wyse terminal)
windows 2008 r2 server
working until we configured rds server and added licenses
all others able to connect as usual but these clients now will not even get to the login screen before we get the error:
because of security error client could not connect to remote desktop
need help resolving this issue
all help is greatly appreciated
David ElebuteSystems ConsultantAsked:
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David Johnson, CD, MVPOwnerCommented:
1. Go to RD Licensing Manager
2. Right click on your Licensing Server name and select properties.
3. Change Connection Method to 'Web Browser'
4. Go back to the Licensing Server and right click on your server.  Select Advanced -> 'Reactivate Server'
5. Reactive server via the given Wizard + web browser
6. Delete the following registry keys (they will be reset when you reboot)
           HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM
        X509 Certificate
        X509 Certificate ID
        X509 Certificate2

Check out these other resources
Source: http://bit.ly/1UD1JGU

Note: These clients will have to be updated to RDP 6 (minimum) if you update your servers.

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David ElebuteSystems ConsultantAuthor Commented:
thank you David Johnson, MVP
all working well again
greatly appreciated
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