There a few things in your bug report that seem odd.

1) Number of Leaf -> Ultrapeer Connections: 2 --- That should read at least 3 I thought ---

2) Received incoming this session: false --- Something is blocking the port ---

3) External Port: 6348 --- That I thought should match your firewall port configuration --- quote "I open my port 6346.
I unblocked Limewire in firewall."

You can change your LimeWire listen on port by 1) tools 2) options 3) advanced 4) firewalls -- Listen on port - you change this to 6346 --- click apply then ok. If you don't click apply the changes will not take effect.

Or else configure your Firewalls to allow access to port 6348.

How long had LimeWire been running when you did the bug report?