Since you don't seem to want to give your details on the forum...

Did you ever delete LW's preferences folder (as per my PM)? If not, try it.

If you do not go through LW's setup wizard after deleting the prefs folder - you haven't done it properly. In that case, try again & make sure that LW is closed before you delete.

Did you ever try port forwarding? I have no idea of what Linksys model you have, because you didn't tell me.

Did you remove all LW rules from your firewall & then add them again (as per my PM)?

Please look at the fixes in this post & try them: If LW Will Not Connect