How to Fix Nginx Upstream Connection Refused on Port 80
When nginx logs show "upstream connection refused" while connecting to port 80, it means ...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labHow to Fix Firefox Secure Connection Failed Malware Warnings
If you see a "Secure Connection Failed" error in Firefox and suspect malware, it's of...
How to Fix 'fatal: refusing to merge unrelated histories' in Git
If you see fatal: refusing to merge unrelated histories when running git merge...
How to Fix Cloudflare Origin Certificate Invalid Error
If you see a Cloudflare origin certificate invalid error, your browser or server is rejecting the...
Nginx Upstream Connection Refused: Diagnosis and Fixes
When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...
Fix Nginx Redirect Loop in WordPress
You visit your WordPress site and get a "redirect loop" or "too many redirects" e...