Firewall issue (an other)

[Shrimp]

I do have a trange behavior from my firewall and I am trying to understand but to no avail....

My firewall is a physical router.

My firewall is setup to let traffic go out, all of it.

My firewall is also setup to block traffic comming in unless I specify otherwise by opening specific ports.

Currently, the port configured in my uTorrent is NOT open in my fiewall.

My uTorrent version is 2.2.1

I have deactivated the following in uTorrent :

Enable UPnP port mapping

Enable NAT-PMP port mapping

My understanding was that I had to open the port in my firewall so uTorrent could work but actually, everything is working correctly, I mean, I am seeding and leeching with no problem at all even though my firewall is not set to let traffic in to the uTorrent port.

Now, is this a normal behavior? Are all the connection made from the inside and this is why it is working?

Any insight on this will be welcome. I know basics of networking but I am far from an expert.

Thanks is advance for your lights.

[Shrimp]

Update

When I run the test in the uTorrent Setup guide it failed the network test.

How come I still can upload and download?

[GTHK]

Setup guide network test just plane sucks. http://bt.degreez.net/firewalled.html