Ubuntu firewall settings

Recently I started using the wicd network manager to connect to PAL
2.0 and it works fantastic

But Now i am facing a new problem"

When the wireless network is secured, all websites open well in the
firefox browser. Example (http://www.lemurproject.org/doxygen/lemur/
html/index.html)

The websites i am talking about are sourceforget nets which probably
are not the "secure" websites

However these websites are not opened anymore when I am on a unsecured
wireless network.

all the gmail, secured university webpages are accessible and open
well

Guesses:
Firewall settings, but I dont know how to add a webpage as a secure/
trusted webpage so that even from the unsecured wireless network i can
access these

WICD manager settings, the settings in there do not allow me to access
webpages that  are not trusted

Anybody has any idea?