
Troubleshooting
How to Fix Nginx Upstream Connection Refused on Port 80
When nginx logs show "upstream connection refused" while connecting to port 80, it means ...
Clear technical guides for everyday software errors, configuration problems, and productivity tools.

When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

You're seeing a Cloudflare 522 error: connection timed out between Cloudflare and your origin...

You're browsing in Chrome and see a full-page warning: Your connection is not private...

You registered a new domain, set it up with Cloudflare, but after hours (or days) the site still ...

You start a Docker container and it exits within seconds. The logs show nothing obvious, or they ...

You change a DNS record in Cloudflare, wait, and the old IP still resolves. This is a common frus...
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