This is forum I am trying to open:
http://blablacorner.forum.st/
Whenever i visit page there is error like this:

When other members try to enter they can, but I cant. What can be the problem? I also checked the
Windows/System32/drivers/etc/hosts and there is no blocked website.

I can access the forum too. Can you try using firefox?

Problem is same on any browser.
Firefox:

Chrome:

I can also access the forum. Did you try clearing cache? Also try clearing DNS cache:

Start>Run
In the window that comes up type in the little box 'cmd'
then 'enter'
A window will pop up, type in
'ipconfig/flushdns'
then 'enter' again
It will report back that it has 'successfully flushed the DNS resolver cache'.

Ok I did that. Atm I can access forum. We will see later on

Can be considered solved or you still have a problem?

Well, lets say its solved.