What do you mean by "reset by peer"? Do you mean the connection was stopped by the remote host?

The .net file isn't a newer one. This one is from this morning (CET), but I don't think it will work, since it doesn't contain very many ip addresses.
ftp://anonymous:anonymous@whitedrag...rg/gnutella.net

First try entering router4.limewire.com : 6346 in the connections tab manually ( or 64.61.25.171 : 6346 if your DNS is down).
Did you try restarting LimeWire? - If it still doesn't connect, - check your connection first and then you may put the blame on LimeWire.