Event ID - 1000

Event Id1000
SourceTermService Event
DescriptionUnable to acquire a license for user username, domain domainname.
Event InformationWhen you try to load a program on a Windows 2000-based Terminal Server that is running Citrix MetaFrame XP,this event with event id 26 from "Applicatin Popup Event" will be looged in. This server is one of a group of four Windows 2000-based Terminal Servers. The other three servers are running Citrix MetaFrame 1.8. All of the servers are running programs for Microsoft Windows 98- and Microsoft Windows NT 4.0-based clients. The three servers that run Citrix MetaFrame 1.8 are functioning normally. 
CAUSE :
This behavior can be caused by a problem with the Citrix MetaFrame XP licensing software. After Citrix MetaFrame XP licenses are upgraded from Citrix MetaFrame 1.8, the Citrix licensing program sees the licenses as migration licenses. The behavior is not caused by Terminal Server licensing. 
RESOLUTION :
To resolve this behavior, uninstall the Citrix MetaFrame XP licenses, install the original Citrix MetaFrame 1.8 licenses, and then reinstall the Citrix XP connection licenses. For further information, you can contact Citrix technical support at 1-800-424-8749.
Reference Links Licensing Events 1000 and 26 on Windows 2000-Based Terminal Server That Runs Citrix MetaFrame XP

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