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I am using Ubuntu 10.04 (installed using Wubi in Windows 7) and when I change my proxy settings to no proxy (without any proxy server), I am unable to access any page (using Firefox or Google Chrome) on the internet except for pages on our local intranet (internal to IIT Kanpur)

I am a student of Indian Institute of Technology Kanpur (IIT Kanpur). When I change my domain name servers from my default IITK ones (mentioned below) to Google Public DNS (,, I am able to access the internet normally.
Default (IIT Kanpur recommended) settings are:
DNS -,

We are supposed to Authenticate our identity before accessing pages other than the internal ones, say to access Google (IIT Kanpur uses a using Fortigate Firewall for this purpose) if we are using no proxy server. And if wish, we can also use proxy servers (like or for accessing the internet.

Also, whenever I start using Ubuntu initially after installation (happened to me with Ubuntu 12.04 also), I can access the internet normally for few days after which I notice that one by one all the websites are inaccessible via no-proxy. I am puzzled by this issue

When I started using Ubuntu after installation using Wubi(Windows Ubuntu Installer) from Windows 7, I noticed that I could use authenticate my identity and use the internet normally for a few days. Afterwards, I started noticing that I am unable to access certain websites like Wikipedia but could access Google normally, and soon after this, I was unable to access any website outside our IIT Kanpur network even after Authenticating the firewall (Page Not Found Error). This surprised me. But I also noticed that I could always access the internet normally using any one of the proxy servers provided by IIT Kanpur.

Please note that I never face this problem when using the no proxy settings in my actual operating system i.e. Windows 7.

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Please comment if anything is not clear or information is incomplete. I can provide any necessary details if needed. –  user2001116 Jan 23 '13 at 16:53
Are you inside the university network when you are trying it? Can you try to open a terminal and enter host and host INTERNAL_HOST where INTERNAL_HOST is a hostname inside your network? Do both commands work properly? –  qbi Feb 5 '13 at 7:06
@qbi Yes, i am inside my university network all the time. –  user2001116 Feb 6 '13 at 13:06
@qbi No, the first command host is NOT working properly. But the latter host returns a valid IP address –  user2001116 Feb 6 '13 at 13:18
For the host, no Aliases are printed. –  user2001116 Feb 6 '13 at 13:27

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