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Event ID: 1311 Source: NetLogon

Source
Level
Description
There are currently no logon servers available to service the logon request.
Comments
 
After multiple Terminal Server clients establish a session with a server running Microsoft Windows NT Server 4.0, Terminal Server Edition, additional clients cannot connect. When this occurs, in some cases, clients cannot browse certain servers or domain controllers after a specific number of client sessions have been established. If the Terminal Server computer is a member server, then you might see this event logged. See ME232476 for a solution to this problem.

See ME193836 and the link to "Symantec Knowledge Base Document ID: 2002022109065948" for additional information about this event.

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