RedHat 9 and CS 1.6 network configuration

New to linux. Just installed RedHat 9 and I'm trying to install a CS
server.

I've successfully got the CS server running a LAN game but I'm unable
to run an internet game.

The command I used to start CS server is

..hlds_run -game cstrike +ip xx.xx.xx.xx +map cs_assualt....

Here's the server output

Console initialized.
scandir failed:/usr/steam/hlds_l/./platform/SAVE
Protocol version 47
Exe version 1.1.2.3/Stdio (cstrike)
Exe build: 19:55:29 Jan 13 2004 (2637)
STEAM Auth Server
couldn't exec language.cfg
WARNING: UDP_OpenSocket: port: 27015 bind: Cannot assign requested
address
FATAL ERROR (shutting down): Couldn't allocate dedicated server IP
port 27015.
Add "-debug" to the ./hlds_run command line to generate a debug.log to
help
with solving this problem
Thu Feb 5 06:12:02 EST 2004: Server restart in 10 seconds
Thu Feb 5 06:12:03 EST 2004: Server Quit

Question - do I have to open the required ports through iptables or
can I turn off network security via GNOME would that work???

My understanding these are the required ports for cs 1.6:
UDP 1200
UDP 27000 to 27015 inclusive
TCP 27030 to 27039 inclusive


Please help...I've been stuggling with this for 2 nights