I am a touch curious why you chose LW 4 instead of 5 initially. However if you prefer LW 4 that's fine.

For LW 4, see If LW 4 Will Not Connect (click on the blue link). You will most likely need to replace the Gnutella.net file for LW 4.

If still no good, if possible supply some more details, such as brand names & models of connection devices, etc.