I don’t know what the issue is, but the website keeps on loading and showing network error. Please find the attached screenshot. Usually, the site will load within few seconds. Due to the loading issue, I tried to restart the server. After the restart, for few minutes, the site was loading fast. But, now again it is not loading.
If you use an application manager or proxy configuration ( php-fpm, passenger, gunicorn/unicorn, Tomcat, etc ) you will also want to try restarting the application itself if it is not running.
If the application has any debugging facility, that may be useful in narrowing down the source of the issue. Typically for application issues, the best resources will be the community, documentation and support forums for the application software itself. We encourage you also leverage our community as well: DigitalOcean Community | DigitalOcean
The system and application error and access logs may include additional details that could provide more insight on this as well. This guide will help you learn to work with common logs in typical log paths but your application configuration may use more specific locations: How To View and Configure Linux Logs on Ubuntu, Debian, and CentOS | DigitalOcean