you could try
1. rm -rf /usr/share/apps/konqueror/
2. open konqueror then Go>Home Page and see if it works
3. Reinstall kdebase4-dolphin-4.6.5-1pclos2011
if the problem persist see if this http://www.konqueror.org/investigatebug/#http can help you
Thank you. It now works. I *believe* the problem was with the nameserver in etc/resolf.conf It was wrong. I went into the interface configuration and unchecked "Get DNS from server" and used two addresses that apparently are failsafe addresses. i read the page at the link you provided. Then started to get curious about the "host not found" error message.
This has fixed it. I guess FF doesn't use /etc/resolv.conf.