Strange internet problems?

Question

Computer networks

Good afternoon. I have an interesting situation with the Internet.
There is a server running under win server 2003 and the network is small.
The Internet comes to the server and is distributed to computers through standard Windows tools (in the network connection settings, Internet connection sharing).
The Internet regularly disappears, not all, but in particular access to mail.ru.
What is most interesting is that if I open it on my macbook in safari, this site opens, but not in chrome.
On the phone through the wafer is the same. For people through the Internet, the explorer also does not work.
There are 4 network inputs on the server. I switch to another one, check the box for general access and everything works. After some time, the situation repeats itself. What does the Internet work fine, only mail.ru :)))
Who has any ideas?

Answer 1

What's wrong! The entire Internet, except for mail.ru, works, this is a dream, you need to rejoice!

Answer 2

In our provider, there was crap with mail.ru, and the site opened, but when you click on the input, it always loads and timeout)

Answer 3

monitor ping, trace and resolve and look for trouble