gotafix, we're going to need some info
What has changed since everything worked well...hardware? ISP? New software? Anything? How long have you been having the connection problem?

Have you double checked your firewall config & made sure that you're only using 1 software firewall? Have you done this port test & did it work?
http://www3.limewire.com:6346

What are your details?

OS(Win XP etc)
LW & Java version (help > about LW & you'll see)
Firewall you're using
Modem/router brand & model
ISP
Connection type (DSL etc)
Where you connect from (home, school etc)
Are you sharing a connection with other computers
Is this your first try with LW

How's your router set up? Do you have UPnP enabled or are you port forwarding (or neither)?