When you say the wall is dead do you mean that the icon is gone?

Yes, but the little message in the direct connect tab is still there.

What's your modem/router brand & model? If your router supports UPnP, try enabling it & checking it within LW's tools > options > advanced > firewall config.
Really, if the firewall icon isn't showing I'd have thought you'd have no prob with direct connect. Tools > options > bug reports > view example. Scroll down to 'recieved incoming this session'... is it true or false?

The modem is Westell Versalink 327W.

Ok it supports UPnP, try enabling it. Also look at the bug report as in my last post (late edit, sorry).

It is true, and I eneabled it...

If the bug report's true then you shouldn't have a firewall problem... means that you can accept incoming connections. I don't know why direct connect's not doing it! Have you tried restarting LW? You could delete your preferences folder (when LW's closed), that seems to fix some weird problems. Points 2 & 3 here
Fixes for LimeWire
This will kill your settings within tools > options, you'll have to re set everything afterwards. Give LW a while to settle down & see what happens.

I really don't see why you would need to port forward but try it if you like! You should be right using port 6346. Just remember to set up a static IP address first.

I erased the preferences, and the brick wall came back

EDIT: Also,the bug report thing is false...

You're going to make me cry. Make sure again that your firewall is set up right. Did you go into options & select UPnP again? Make sure that the listening port number is still the same as originally (because that's the port number you've allowed through your firewall). If you find that the port number's changed, change it back & give LW time to settle again.
It might be time to try port forwarding
I don't know what's going on with your set up or why this is happening.

Well, I changed the port and after a little while, the wall went away again! and the thing is true. but I still get the you cannot direct connect thing...