All people in this thread...try the fixes below (click on the blue link).
Including updateing/rolling back Java, deleting preferences folder & replacing gnutella.net file. Remember to only have 1 Java version installed at a time.
If LW Will Not Connect

If you're sure that you've done all of those things correctly (with LW properly closed & restart afterwards), try the fixes below. The post's really old but a couple of people have recently found that it's fixed their problem.
For those who can't connect

Frostwire users: Even though the fixes refer to LW, it's all the same for FW.

If nothing there helps, pleeeease post your system details. Otherwise, how can we help you if we don't know anything about your setup? You'll find a link to system details in the 'will not connect' thread...that explains which details we need.

Ladychud,
Even though you can connect sometimes, if you give us your details then we might be able to help with that.

Atlantic78,
When you post your details, could you also list all of the fixes that you've tried so far?