- Make sure that FrostWire is not running [you can be certain by opening it again and then closing with File > Exit [FrostWire on Windows] or FrostWire > Quit [FrostWire on a Mac]
- Go into the windows firewall > Advanced > Inbound Rules
- Delete all references to FrostWire
What you want to do is make sure your firewall will specifically ask for your permission to allow FrostWire to connect the next time you execute it. That should reset all the parameters and allow FrostWire to connect.
If you are using any other firewall, close FrostWire completely delete anything that has to do with FrostWire in your firewall's settings and reopen FrostWire to reset the parameters.
If you have any security center (such as McAfee Security Center or zone alarm, etc.) make sure that it's allowing FrostWire. You might also check if your anti-virus program or a malware monitor is not killing FrostWire or any of it's processes.
You may need to manually port forward your router, if you have one.
You will need to manually set the FrostWire ports to another value.
Go to Tools > Options > Advanced > Firewall
Select manual port forward and enter a value for the listening port, tcp and udp the same. You can use 6900, for example. It should be above 1024 and below 64000.
Click Apply and OK, and terminate FrostWire.
Even if you don't have a router, this procedure can get around ISPs blocking the standard port. It does not hurt! If you are on a system with many ports blocked, choosing 443 may get you around that problem, but that is an avenue of last resort.
If you don't have your router's documentation handy, http://portforward.com can provide a wealth of information. Choose the same port that you used for FrostWire, and forward it to your local IP. If you find in necessary to port forward, most routers have a facility that allows you to fix that internal IP to a device. Do that. That way, when the license renews, it'll select the same IP and you won't have to adjust it again.
To test the new setting:
Do a search for UBUNTU
This is a well seeded torrent and is normally very fast.
Try to download it and see what happens.
If it downloads, simply remove torrent and data and know that it is now working.