Each time trying to go to unity3d.com, I get an error that there is no such address 
Sorry for my english.
Tried by Mozilla, Opera. Everywhere adding identical. I was looking for the problem in antivirus, but everything is normal.
It’s fine here. Useful link: http://www.downforeveryoneorjustme.com/
–Eric
And?
I can’t enter.
Might be a problem with your DNS. Try google’s - Get Started | Public DNS | Google for Developers