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Fix Nginx 502 Bad Gateway: Upstream Connection Refused - Cloudflare Origin Certificate Error After SSL Mode Change-Firefox Secure Connection Failed Troubleshooting Steps

Updated 2026-07-28 11:11:25macos-help

Fix Nginx 502 Bad Gateway: Upstream Connection Refused - Cloudflare Origin Certificate Error After SSL Mode Change-Firefox Secure Connection Failed Troubleshooting Steps

Prepare

Execute

Validate

Document

Operational follow-up

Record the exact option, command, or setting that changed the result.
Keep a rollback note if the workflow affects shared files or team settings.

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