It looks to me that the problem is at opendns.
It blocks this webboard.
And why using a website to block other websites?
That doesn't make any sense at all.
I don´t wanna be rude, but it doesnt make sense to you because you really dont know what opendns is and how to use it... go to
www.opendns.com read whats about and then you´ll untestand.
Is web filtering by DNS, with a great and growing database, the web i mentioned is the display message of the cause an specific web was blocked.
By the way i checked now and the problem has been solved.
Thanks Avast it was quick!