Steam Client
* UDP 27000 to 27015 inclusive (Game client traffic) * UDP 27015 to 27030 inclusive (Typically Matchmaking and HLTV) * TCP 27014 to 27050 inclusive (Steam downloads)
Dedicated or Listen Servers
* TCP 27015 (SRCDS Rcon port)
In addition to the required ports for Steam, Modern Warfare 2 requires the following ports for multiplayer:
* UDP 1500 (outbound) * UDP 3005 (outbound) * UDP 3101 (outbound) * UDP 28960
Open Nat:
* TCP 27014-27050 * UDP 1500, 3005, 3101, 27000-27030, 28960
If anyone is looking for the co-op ports for hosting “nazi zombies” on cod5:waw or cod:5 co-op missions these are the ports I use (below):
Checkout portforward.com for a guide on “how to” port forward on your router make/model, be sure to download the latest COD:5 WAW – World at War’ PC Patch from callofduty.com.
3478, 3479, 3074, 3075 for UDP 80, 443, 3074, 5223 for TCP 3074-28960 for UDP 3074-3074 for TCP 20800-20810, 28960-28970 for UDP
Want to directly download torrent via your remote linux server? use cTorrent 
(what are Torrents? here).
http://ctorrent.sourceforge.net/
http://www.rahul.net/dholmes/ctorrent/ (enhanced ctorrent).
*Tested on “CENTOS 5.3 i686″.
How to get started? – just copy and paste the below line of text into bash downloads installs everything!
wget http://kent.dl.sourceforge.net/sourceforge/dtorrent/ctorrent-dnh3.3.2.tar.gz && tar xzf ctorrent-dnh3.3.2.tar.gz && cd ctorrent-dnh3 && ./configure && make install && hash && ctorrent -h
usage -
ctorrent -s newfilename -e 12 -C 32 -p 6881 filename.torrent //Press 'h' or '?' for help (display/control client options).
Done! Now you should see this screen w/ options (below).
Also check which ports are enabled by using “nmap”.
Install “nmap” (on CentOS 5.3) -
yum install nmap
Then run this cmd to see which active ports are enabled on your server.
nmap -sS -O 127.0.0.1
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