Some things to try, replace the gnutella.net file as described here If LW 4 Will Not Connect (click on the blue link). LW must be closed at that time. If the other LW is connecting fine, perhaps even try the gnutella.net file from that program's preference folder.

I presume you set LW's firewall option for port forwarding, the same port as you port forwarded the belkin. Manual port forward instructions & sample image

(yes there are some people who do not know what hyperlinks are. lol)

I already did follow the hyperlink and delete the file, I will try to download a new one after work, and yes I did set up port setting for LW and the router on the same port.