Event ID - 22

Event Id22
SourceTermServLicensing
DescriptionThe Terminal Services Licensing server <server> has no license pack registered for product Windows 2000 Terminal Services Client Access License. Use Terminal Services Licensing administrative tool to register the licenses pack.
Event InformationHere is an information from a newsgroup post: 
The only thing that resolved the issue was to delete the "HKLM\Software\Microsoft\MSLicensing" subkeys "HardwareID" and "Store" (which causes the client to re-register and basically eat up another CAL) on every client.
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