1👍
it is DNS configuration problem.
for sure about reason open putty and see output about site content by curl or wget or lynx.
example:
lynx mysite.com
if it work and returned proper result nginx config is true but it is DNS problem.
dns problems:
- /etc/hosts
- /etc/hostname
- bad configuration
try ping sitename.com on your pc with ms dos. if has timeout then its not nginx problem.
Source:stackexchange.com