LW works fine for millions of people all over the world. A few have set up problems like you're having.

1. Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say 'Your test worked!'. What happens when you go there?

2. Did you configure your firewall so it allows LW full access (advisable not to have 2 active firewalls b/c they can interfere with each other); Firewall configuration instructions (click on link)

3. Connection type? (eg: dialup, broadband, cable, etc.)
4. 2wire lc_usb model number?
5. Where are you trying to connect from (home, school, work, etc.)?
6. What version of Limewire (LW) & Java do you have? (Go to LW's menu Help>About LW...) Will show both LW & Java version.
7. Who is your isp provider (Internet Service Provider)?
8. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up.

AFAIK 2wire devices don't use UPnP. But then again, USB devices are generally safe from this point.

Have a look at your 2wire lc & see if there's a UPnP switch on the outside of it.

Have you ever logged into your 2wire lc_usb device? Try typing each of these into your browser & tell us what happens: 1. http://172.16.0.1 & if that doesn't work then 2. http://gateway.2wire.net
You should be able to log into your modem device & see what firewall options there are. See if there's a UPnP (Universal Plug & Play) option.