So atlast I am able to connect successfully by using crclient. I did as ./crclient -u myname and it asked for password then it said
./crclient: user ggopikrishna successfully logged in to server ''
But I am not able to open web pages.Like using Mozilla browser it says "Page not found" or unknown host or something like that.
Actually when I searched I found a similar problem from somebody yesterday but I forgot that link, I am keeping on searching but in vain

Somebody suggested him to alter something .... because he said like packets are not being sent from his system to server and so he is not able to make a request to the server..... And later when he altered that it worked for him...... Damn I cant find that site I am really sad. Please anyone knows it? Thanks.