Everybody who is using watchguard firewall! The firewall manager software is using port 4101! Uninstall the Firebox system manager, reboot the server, or in the task manager end the CONTROLD.EXE process.
If you don't use the Watchguard system manager and the 4101 port is used by a process, see it with "Active Ports
", and this is show you witch program use the port.