1. what OS version (eg: Windows 98, XP,OSX, Vista) ? XP
2. What firewalls you have ? WINDOWS FIREWALL, MCAFEE
3. How much ram ? 512 mb
4. Hard Disk space available ? PLENTY
5. Connection type (eg: dialup, broadband, cable, etc.) ? BROADBAND
6.Modem what brand name & model numbers ? WIRELESS CONNECTION
7.Router brand name & model numbers ? ?
8. Where are you trying to connect from (house, apartment complex, school, student accommodation, work, etc.) ? APARTMENT COMPLEX
9. What version,LimeWire & Java, are you using. Go to L/W's Help/About L/W, THIS show both LW & Java version.? L/W VERSION 4.12.6 JAVA 1.5.00_6
11. Do this test click here: http://www3.limewire.com:6346/ should say 'Your test worked!. What happens ? YOUR TEST WORKED
12. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up. NO
13. Is this your 1st try at LW, or is this a new problem with an experienced user.? NEW PROBLEM W/EXPERIENCED USER
14. Do you see a brick wall in front of the blue world icon at the bottom of LW's interface ? YES
15. Have you given full permissions for LimeWire to pass through your Firewall ? YES
16. XP users, Please state XP firewall on or off.? ON
17. In Start & remove Programs, Is this update Installed, "Security Update for Windows XP (KB931261)" ?
If Windows Updates are not seen, Tick the box at top of page, (show updates) ?
18. Are you using Manual Port faward in LimeWire OR UPnP ? UPnP
You can check HERE, IN LimeWire Go, Tools/options/advanced/firewall

For the last couple of days I have been unable to connect as well. I have never had any problems connectig before, and I have been a user of L/W for about 6 months. Can someone please help? Thanks