Everything stopped working suddenly

This is very weired. My Nginx/php/mysql is working fine. However, when I visit the webpage nothing happens … I get a message that safari can’t connect.

I tried to look at Nginx error log and nothing is there. It’s like if there was a dsconnection between my server and the external word.

What else can I do?

I find the problem… it was my fail2ban. I will need to adjust my firewall. Does ee comes with a firewall?