Nginx Proxy Manager 502 Bad Gateway checklist
A focused path for Nginx Proxy Manager hosts that return 502 after a Docker, upstream, port, SSL, or Cloudflare change.
Fast recovery path
Check the forward host, forward port, upstream scheme, container network, direct origin response, WebSocket setting, and SSL mode before changing DNS again.
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When this fits
Nginx Proxy Manager shows 502 Bad Gateway, the target app works only locally, or Cloudflare/NPM routing changed during launch.
What the pack adds
A private checklist for DNS, proxy mode, NPM upstreams, TLS, redirect loops, origin health, exact 502/521/522 triage, and rollback notes.
Free before payment
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Operational checklist only. Confirm DNS, hosting, firewall, Nginx Proxy Manager, and Cloudflare settings in your own dashboards.