Port 50000 is used for Modem emulation option on ConnectPort TS product line(please refer to user manual for description of this featrure). Port 50000 can be disabled from the command line; ‘set service’ command will display available services, and ports associated with these services Here is a snippet how it looks: 29 on 50000 na na 200 Modem Emulation (Pool) 30 on 50001 off off 200 Modem Emulation (Port 1) 31 on 50002 off off 200 Modem Emulation (Port 2) 32 on 50003 off off 200 Modem Emulation (Port 3) To disable service issue following command #>set service ra=29 state=off, Repeat this command for all indexes you would like to disable