I had the very same problem and it turned out that my router was just broken. I've tried to do different stuff and it didn't help. Then I've just bought a new router. And this time it helped. BTW,...

Thank you for creating this thread, OP. I had a very same problem, but now it's solved.

I know, this is an old thread, but I have a problem with the site right now. It doesn't open, despite the fact it was not blocked. What can it mean?