Hello.
I can't totally exclude it, of course.
But if UPNP works, Emule works and I tired several ports on LW, I would exclude it.

I feel that is probably a TCP/UDP issue, anyway.

In the past I had problem on Port forwarding that includes both the protocols on the same ports.

So, if I find detailed info on which of the 2 LW ports is dedicated to UDP packets transfer, I could check a more precise config of the HW Router awa the SW Firewall.

I thank you so much for replying because I noticed another strange behavior of LW.

I tried to move the saved folder from the default Documents/Limewire/Saved one, to another disk on the same machine.

I have to force it because after I push the confirmation button on the config window, the path to the saved folder doesn't change.

So I have to copy and paste the path to make it work.

It works properly until I shut down LW.
When I launch it again, an error window appears teling me that the selected storage resource is unreachable for various reasons etc.... (the meaning is this but the words are different).

Of course I tried to give "everyone" full control on that unit and, as I told you, it works if I force the config. on the fly.

Is it a wished, known LW behavior?

Many thanks for any suggestion you wish to provide

Stefania