Konqueror has Problem with WWW

Hello,
my system was an SuSE 11.1 system and the Konqueror has a big Problem to connect to the Internet.
I’m using a proxy-connect, there are all configed and the firefox-browser can connect to the internet.
Only the Konqueror-browser makes problems. He say “Access denied” at the firewall-server, but why does firefox connect without problems?

I never know more .

Please help me.

Chris