Some clients can RDP, but some get the "Remote Session disconnected because there are no TS License Servers available ..." error.

In a Windows 2003 Domain with XP clients (mixed SP2 and SP3) I'm encountering the following error.

"The remote session was diconnected because there are no Teminal Server License Servers available to provide a license. Please contact the server administrator."

Some clients can connect and some can't. We just deleted about 20 disconnected sessions and they have not enabled any connections.

Steps I've taken that haven't resolved the issue.
- Delete HKLM\SOFTWARE\Microsoft\MSLicensing\Store key
- Delete HKLM\SOFTWARE\Microsoft\MSLicensing key
- Verify key permission are "Authenticated Users" Full
- Tried as domain admin
- Spoken to the admin on the remote server and removed all suspended sessions and verified the server is in Per Device mode.

I'm about to try one of the users that can RDP on one of the machines that can't, but if anyone has encountered this before and can advise I would be most appreciative of the advice
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Just change your licensing mode on your terminal services licensing manager to per user and it doesn't track licensing.  I know that sounds shady but that is exactly what Microsoft told me to do last time my licensing wouldn't release.

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AdoBeeboAuthor Commented:
That made me chuckle - I've passed your comment it on to the server admin - it's in another data centre, so not my box. Will post back his response if he can make the change
AdoBeeboAuthor Commented:
I'd like to get to the bottom of what caused it, but we never have the time. The SA for that box changed it over to Per User and wouldn't you know it ... success - I don't know if we'll keep that model, but for now we've got what we need, so thanks
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