If a person has a router then they need to open ports in order for information too pass back and forth between computers. A router firewall a.k.a. hardware firewall, blocks these ports to protect your computer from Hackers, Viruses and Worms.
The ports you need to open are usually in the games readme.txt file. Read your routers manual to find out how to forward these ports with routers software.
The site below has a large list of many different programs, telling you what ports need opening. www.portforward.com
Tip: Dont use multiple firewalls! your routers firewall is sufficent enough. There's no need to have a software and hardware firewall combination. This will just lead too conflict, so disable that Windows Firewall or any others.
In August of 2004, Zappi, Homba, Bambam887, RedScorpion and MOOXE all pitched
in to create this Close Combat site. I would to thank all the people who have visited
and found this site to thier liking. I hope you had time to check out some
of the great Close Combat mods and our forums. I'd also like to thank
all the members of our volunteer staff that have helped over
the years, and all our users that contributed to this site!