Browser can't reach the site

Check: Cloud firewall/security-group rule for 80/443; `ss -tlnp | grep nginx`. Fix: Open 80/443 to your source range; nginx listens on all interfaces by default.

502/504 from a proxied app

Check: `nginx -t`; upstream service state. Fix: Fix the upstream block in conf.d and `systemctl reload nginx`.

Config change not applied

Check: `nginx -t` syntax check result. Fix: Correct the error shown, then `systemctl reload nginx`.

Troubleshoot NGINX Web Server (Hardened) — DC Associates Group Docs

Symptom	Check	Fix
Browser can't reach the site	Cloud firewall/security-group rule for 80/443; `ss -tlnp \| grep nginx`	Open 80/443 to your source range; nginx listens on all interfaces by default.
502/504 from a proxied app	`nginx -t`; upstream service state	Fix the upstream block in conf.d and `systemctl reload nginx`.
Config change not applied	`nginx -t` syntax check result	Correct the error shown, then `systemctl reload nginx`.

Logs & useful commands

/var/log/nginx/access.log, /var/log/nginx/error.log; `journalctl -u nginx -f`
Health: curl -fsS http://127.0.0.1/ (returns the default page)
First boot state: Service is enabled at build; nginx serves immediately on first boot. No credential generation.

Still stuck? Email support@dcassociatesgroup.com with the product name, cloud + region, instance size, and the output of the health command — first response within 1 business day, most tickets same-day.