host lookup failed can't use Mozilla or email but ping is OK
I have installed Redhat 9 (kernel 2.4.20-6) as dual boot with Win XP. Am using Gnome desktop. Have external serial modem on com 1. I seem to have modem and ISP more or less set up OK as I can ping and get a response. When I try to use Mozilla I get "host lookup failed" after a long time. DNS server address came from my ISP and is 220.127.116.11. Tried to set up Evolution email and got similar message when it tried to go to my pop server. In my network profile, I only have the modem connection (ppp).
I am guessing it is maybe a firewall problem or maybe I need to tell Mozilla and Evolution to use the modem networking, but I don"t know how to proceed.
Any suggestions would be appreciated.