how to solve

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Remote desktop connections remain active until the logged in user selects "Log Off" from the Start Menu. If a user closes the remote desktop window without logging off, the user will still remain logged on.

Only up to two simultaneous Remote Desktop connections are allowed by default and active and disconnected sessions are calculated in this connection limit.

If a third simultaneous attempt is made to login to the server "The terminal server has exceeded the maximum number of allowed connections" error will be shown to the user, and they will be unable to complete the login process.

Fortunately, there is a way around this:

    * Click OK to the error message.
    * Type mstsc /v:xx.xx.xx.xx /f -console into Start – Run replacing xx.xx.xx.xx with the remote IP

    if dosen't work , try this

mstsc -v:x.x.x.x /admin

    * Login with Administrator account.

This will connect you to the remote computer.

below web told us how to kill one session.