Your internet provider has probably noticed the large amount of information being passed back and forth. I have been cut off twice with 2 different service providers, and have yet to find a way around it. the firewall that limewire detects is their's and not on your computer. Good luck with it.

I don't think ag101 is still waiting for help...their thread's more than 2 years old

If you think your ISP's to blame for not being able to connect to the network, you could try changing ports. In LW tools > options > advanced > firewall config. Change LW's listening port to 65000 (or any port in the range of 49152 - 65535) > apply > ok.
Also try using LW outside of your ISP's peak hours.

Otherwise, you could give us your system details...maybe there's a firewall within a modem/router that's causing trouble?
System details - help us to help you -> Provide these details when you post!!!(click on link)