You potentially have to consider 2 firewalls.
1. Software firewall. This is the Windows Firewall or 3rd party firewall if you have a security suite installed. This is easy to disable. Either through Control Panel if it is Windows firewall (as above), or in the application's preferences/options if it is 3rd party.
2. Hardware firewall. You will have one of these if you have a router or modem/router in your network/internet connection. This isn't as simple to disable. What you have to do with this is "port forward". That is, you have to tell your router to forward all traffic that hits specific ports (find out what ports your P2P software uses) to a specific internal IP address (eg 168.192.1.1 or something similar). You con find out your internal IP address by opening a command line and typing "ipconfig" without the quotes. Google your router make and model and "port forward" and you should find specific instructions for your router.
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