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RDP server refuses new connections: user limit or port conflict

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Symptoms

  • This computer can't connect to the remote computer - try connecting again.
  • Only some users can connect; extra connections are refused.
  • Or connections fail entirely while the server is up.

Fix it yourself

  1. Remember plain Remote Desktop allows only two concurrent administrative connections without RDS CALs; more requires the RD Session Host role and licenses.
  2. Check the 'Limit number of connections' Group Policy and the RDP-TCP Maximum connections setting on the host and raise them appropriately.
  3. Verify the affected users have the required sign-in rights (Remote Desktop Users membership / logon rights).
  4. Check for a port assignment conflict: confirm nothing else is using TCP 3389 (netstat -a) and that the RDP-TCP listener shows Listen state via qwinsta.
  5. Restart Remote Desktop Services after configuration changes - this drops every active session on the host, so schedule it and warn connected users first - then retest.
  6. Only after confirming with the affected users (unsaved work is lost when a session is logged off), disconnect or log off stale/idle sessions that are consuming the connection limit.

If that did not help

Attach qwinsta output, the connection-limit policy values, RDS licensing status, and netstat output for port 3389.