Step 1.
Open your FOnlineServer.cfg file and...
AdminPanelPort=0
Value must be greater than 0 and it will be your communication port.
Step 2.
Try connect to server via Telnet, Putty, etc.
Step 3.
Use your admin login and password.
Available commands:
exit - for disconnect
kill - it's killing the whole process
log filenameof.log - saves current log to filenameof.log
start - start the server run
stop - stop the server
state - current state of server: starting/started/stopping/stopped/unknown
...and of course use the ~ to run your void functions or give to your server typical command.