Use PAC file : http://stdwww.iimahd.ernet.in/proxy on browser as shown below
1. Go to Tools-> Options -> Network -> Settings
In “Automatic proxy configuration URL” paste http://stdwww.iimahd.ernet.in/proxy
Go to options -> Under the Hood -> Change proxy settings
Go to Connections -> LAN Settings
Paste http://stdwww.iimahd.ernet.in/proxy as shown
Go to Tools -> Internet Options