[Calystos]

He already had it in his startup line: ./srcds_run -console -game tf +map duel_duel2 -maxplayers 20 -ip 80.246.XXX.XXX -port 28XXX -secure

I suggest you check your IP address setting. I had this exact error when we moved dedicated hosts and the redirect IP address hadn't been updated/enabled yet. Make sure the IP you type in there is the right one, and that its enabled and actually exists else you won't be able to start the server using that IP.