Can you access control with Monster Browser? Right click on your server in the list. Choose "set password". Type in your password and hit enter. Thereafter you can right click on your server and select "remote console", enter your password. To see if it works, then type "status" (without the quotes) in the bar at the bottom. A list of anyone playing, including bots, should appear. Then you can enter any of the rcon commands.
The Hoss - Rawhide part owner