I just wonder what happens when you are using a firewall and you do not have a public ip. Has anyone idea about which ports (TCP / UDP) is the app using?

It will very much depend on what the "app" is. Different applications use different protocols and ports (e.g., a web browser would use HTTP over TCP through port 80, typically).

In any case, most firewalls are able to do logging. In other words, you can try to use whatever app you want to work and look at what protocols/ports it used to go through your fiewall and then make a decision whether you want to allow or deny it.

I'm assuming you are on a Windows machine.

Try pulling up a DOS Prompt [Start Menu > Run ... > type "cmd"] and using "netstat -a -o". This will give you All [-a] the open ports and the associated program [-o] which opened and is listening on that port.

-OFF Topic-

Anthaneezy,pressing the blue button is used to alert Admins/Mods to some illegal activity in the forums.

-OFF Topic-

Anthaneezy,pressing the blue button is used to alert Admins/Mods to some illegal activity in the forums.

It's so darn close to the Quote button though. My mistake.