Journalctl -u nginx

journalctl -u nginx | grep emerg

nginx: [emerg] cannot load certificate "/etc/ssl/certs/ssl-cert-snakeoil.pem": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/etc/ssl/certs/ssl-cert-snakeoil.pem','r') error:2006D080:BIO routines:BIO_new_file:no such file)

Solution: apt install ssl-cert

See also

• Web server: Nginx: /etc/nginx/nginx.conf, nginx -t, Nginx logs, Nginx change log, PHP, php-fpm, Let's encrypt, Nginx directives, Reverse Proxy, Configure HTTP redirection Nginx, Return, proxy_pass (Reverse proxy), ngx_http_rewrite_module, /etc/nginx/sites-enabled/, error.log, access.log, /nginx status, AIO