Dealing with Web Server issues can be tricky depending on your setup. Being we only provide self-managed hosting, we are limited in what we can do for you in such a situation. We may not be able to login and troubleshoot this for you, however we can provide a few different ideas to help guide you in resolving this situation.

The easiest way to locate the cause of the error is to locate the exact error itself within the log file. This can vary based on your setup, but in general these are good places to look:

/var/log/nginx/access.log
/var/log/nginx/error.log

To ensure your server block for Nginx is correct, you might want to read over our article on the subject.

Hope it helps,
Jason Colyer
DigitalOcean Platform Support Lead