There is no central server for LW. If there were they would probably been busted like napster. Think about it!

Configure your firewalls: http://www.limewire.com/english/content/firewalls.shtml

Try these: Fixes for Limewire

For corrupt files see: T3 Spammers

Can you give us a total desciption of your set up:
1. OS version? (eg: Windows 98)
2. What firewalls you have?
3. ram?
4. Hard Disk space available?
5. Connection type? (eg: dialup, broadband, cable, etc.)
6. Modem & router brand name & model numbers?
7. Where are you trying to connect from (home, school, work, etc.)?
8. What version of Limewire (LW) & Java do you have? (Go to LW's menu Help>About LW...) Will show both LW & Java version.