Server Error

[Fouldini]

I have recently set up a CS:S server but whenever my freinds or I attempt to connect it simpley retrys the connection 4 times then times out...However my server dosnt seem to recognise this...
I get the

"Connection to steam servers successful
VAC Secure mod activated
Adding master sever xxx.xxx.xxx.xxx:xxxxx
Adding master sever xxx.xxx.xxx.xxx:xxxxx"

I am going cabled through my router which firewall and security settings are disabled. I have no firewall software on my computer and i can connect the server via the LAN tab.

Any help?

[chconline]

Have you tried port forwarding on your router?

[Fouldini]

Look

Guess im screwed then?
And ive tried DMZ...