CS SERVER

Next I will tell you all the ports you must open in order to make CS:S function properly in web games:

Like we did before with the server port forward, we must add a new entry by clicking "Add" or something similar (depending on your router)

Call this entry CSS1

it should be like so

Check the enable box
Service name: CSS1
Incoming ports: 27020 - 27039
Destination IP Address: "Your Internal IP here, for example 192.168.2.4"
*Destination ports: 27020 - 27039
Port type: Check TCP

Press submit

Now we need to create another, this time call it CSS2:

Check the enable box
Service name: CSS2
Incoming ports: 1200 - 1200
Destination IP Address: "Your Internal IP here, for example 192.168.2.4"
*Destination ports: 1200 - 1200
Port type: Check UDP

Press submit

Now we must make a final one, we will call it CSS3:

Check the enable box
Service name: CSS3
Incoming ports: 27000 - 27015
Destination IP Address: "Your Internal IP here, for example 192.168.2.4"
*Destination ports: 27000 - 27015
Port type: Check UDP

Press submit

DONE!! all the ports required for CS:S to run smoothly have been opened, and a happier CSS is only a button click away :D

Note: if you are port forwarding in order to make a server appear online, and you want the IP for people outside of your wireless network to connect with go here:

http://www.portforward.com/

Your external IP is situated at the bottom, this is the one people will connect to.

so the IP for your server will be:

ExternalIP:Port
For example

80.195.225.71:27015
for a server on the port 27015