Hi 1337_,
I don't have a clue. Since your downloads & uploads don't seem to be effected, it can't be too bad.
When I run FrostWire, I get the firewall icon showing now & then but my d/l & u/l are fine...I just live with it. The icon eventually goes away.

Maybe one of the forum gurus can give you an explanation?? There's a thread titled "Limewire Falsely Detecting firewall", a few posts down in this section...maybe have a read of that.

Sorry I can't be of help