internet connect problem

[Bruce Wood]

Internet connect is working fine on my desktop running 10.1. BUT, I 
forked over the $$ for Jaguar on my iBook, configured internet connect 
the same way (I believe) and I keep getting disconnected after various 
intervals with the message: "Connection terminated because the other 
side is not responding. Please try again."

I know the other side is responding because it has happened while I've 
been downloading mail and in the middle of a program download. Any 
suggestions?
-bw-