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
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