[ubuntu] gsm network problem

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http://ubuntuforums.org – I am using ubuntu 9.04 .I am connecting net through gsm network (aircel) ie through mobile. It shows all web pages but if pages need username password if i typed it ald click logging in button. It shows server not found error and some times gatway error. what i have to do with this probelm. pls help me.thanks in advance. (HowTos)