Most schools nowadays block p2p use b/c it uses up too much bandwidth which they pay lots of money for. There's also the security risks.
You could try a proxy:
A Fix for those whose ISP's block Limewire pages 1 & 2 which has a link to alternative instructions.
But also try this: OK let's try this:
1. Try deleting your LW Preferences folder whilst LW is closed; instructions here:
Fixes for Limewire
2. After opening LW you will need to reset your options, but leave everything at default except the following: Go to Tools>Options>Connections & untick connect on startup & press apply button. (Also go to Tools>Options>advanced>Startup & make sure connect on startup is unticked.)
3. Go to LW's menu File>Disconnect. Wait a minute. Then go File>Connect & wait about 10-15 mins. to see if it connects.