You can look at this link for configuring your firewalls. http://www.limewire.com/english/content/firewalls.shtml

If that doesn't help provide the following information.

Computer and CPU
Operating system and sp (MAC,win98)
HDD
RAM
LimeWire Version
Java Version
Firewalls
Moden type and model no.
Router type and model no.
Connection (Dialup,ADSL,DSL,Cable)
Where are you connecting from (Home,Office, School)
Who is you Internet Service Provider (ISP)

Thank you