Blocked website surfing!

The other day my usual web surfing was interrupted and there was a display showing that 'This site can't be reached'! When I clicked on the RELOAD, there was no response at all.

On clicking DETAILS, there came a display of list of options that didn't work too.

On clicking 'Checking the proxy, firewall and DNS configuration,' a window opened on the right side (Security Overview) and declared that 'This page is not secure'! Inferring that the website is being blocked for surfing by the ISP. 

 I installed UltraSurf, {that assured privacy, security and freedom) to circumvent internet censorship. After this, I could surf through that website easily without being blocked! 

But, I received a mail that someone has tried to access my mail account from United States! This mail arrived after I accessed my mail account next to that easy surfing of the website! The Ultrasurf is based in US!