I have deleted all related to WireShare (as far as I know):

/Applications/WireShare.app
/Users/~/WireShare
/Users/~/Library/Preferences/WireShare

and installed again WireShare. Surprisingly, the
WireShare/Preferences/Advanced/Listening Ports
has values for:
Gnutella port
BitTorrent ports

Is that normal or is WireShare taking such numbers from elsewhere, and thus creating the problem?