dns - Get a Blank Web Page when opening certain sites

I get a blank web page when I try to open certain websites. I am not sure why this happens.

I am able to access these sites using an anonymous proxy though.

Either it has to be an issue with my ISP's DNS Server or the Web Server itself is filtering the request.

I have tried accessing the site using a Perl Script as well and again the same response. Tried with different browsers, same response.

For instance, when I try to open the site, http://imgbox.com

I get a blank page in response.

Here is the source code:

However, I am able to access this site via a proxy.

Also, I was able to open the site imgbox.com properly a few days ago without a proxy.

I am able to ping the site as well.

Where could the problem be?

I have even tried setting my Primary DNS Server to the Google Public DNS: 8.8.8.8 but again the same problem.