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Event ID: 1013 Source: TermService

Source
Level
Description
The terminal server has exceeded the maximum number of allowed connections.
Comments
 
This typically occurs when the server exceeds the number of registred licenses. In "Remote Administration" mode, only 2 concurrent, administrator-level logins are permitted.

We have also this event occuring when firewall restrictions prevented the client to connect to the server properly. The TCP handshake would be permited but not the actual connection on port 3389 (MS RDP). As a result, the server would remain "locked", waiting for the connection to establish. The Terminal Services Manager would not show any sessions as being active. The "quick and dirty" solution is to reboot the server and fix the firewall rules.
It is a good idea to have VNC installed as a backup for access. If you have, logon using VNC and use Administrative Tools\Terminal Sevices Manager to logoff the old sessions. See ME250991.

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