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The following is a list of ports used by Killing Floor. Make sure they are open in your router/firewall. (You will need these to host a listen server)
7707 UDP/IP (Game Port) 7708 UDP/IP (Query Port) 7717 UDP/IP (GameSpy Query Port) 28852 TCP/IP and UDP (Allows your Server to Connect to the Master Server Browser) 8075 TCP/IP (Port set via ListenPort that your WebAdmin will run on) 20560 UDP/IP (Steam Port)
Another setting you might have to deal with when hosting a listen server in your killingfloor.ini is:
ServerBehindNAT=False Set it to True
Handy internet tools I've been pointed too (thanks Sarkie) to test if your ports are open - GRC Shields Up https://www.grc.com/x/ne.dll?bh0bkyd2