I can think of a couple of things, but you didn't provide much information.

Try configuring your firewalls. Instructions can be found here. http://www.limewire.com/english/content/firewalls.shtml

You can also try fixes for Limewire. Instructions can be found here. http://www.gnutellaforums.com/showth...threadid=32552

If those don't help provide the following information:

Computer type and CPU
Operating system and sp (MAC,Win 98)
HDD
RAM
Firewalls
LimeWire Version
Java Version
Modem type and model no.
Router type and model no.
Connection (dialup,ADSL,DSL,Cable)
Who is your Internet Service Provider

Thank you