well firstly if u can go to
http://contraclan.topcities.com and go to faqs to find out many answers but ill be nice and tell u.
Well the problem may be because you have a internet firewall on your computer. Also make sure not to type in anything in the password box if you want it open to everyone. Another reason is that the Configuration for the WormNet settings is set to "Force ip" (so just turn in off to allow people into the game. But if you have an internet firewall in may be more difficult because all firewalls are different. The way I take it off though is:
1. Click on the internet connection picture in the right hand corner (that is if the internet is on)
2. Go to status. Then click on "properties".
3. Next click on "Advanced" and find "Internet Connection Firewall".
4. If there is a check mark beside it, click on it to turn in off. Then press ok, turn off the internet, turn in back on and it should be turned off.

But then again there are also Virus Program FireWalls. And those u would have to uninstall to get it fixed/
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