Fixing Nginx Upstream Connection Refused on Port 443
You see "upstream connection refused" in your Nginx error log when proxying requests to p...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix 'Secure Connection Failed' Error in Firefox for Android
If you see a 'Secure Connection Failed' error in Firefox for Android, your browser cannot...
Fix Docker Desktop Engine Not Running on Windows
You open Docker Desktop on Windows, see the whale icon stuck in the system tray, and the engine s...
How to Fix Nginx 'Upstream Connection Refused' Error
When Nginx returns a 502 Bad Gateway with upstream connection refused in the error l...
Resolving Git Merge Conflicts Between Two Branches
You try to merge branch A into branch B, but Git reports a merge conflict. This is common when bo...
Fix Nginx Upstream Connection Refused Error
If you see upstream connection refused in your Nginx error logs, it means Nginx trie...
Issue queue
SitemapPython Requests Timeout Best Practices for Reliable Apps
Resolving npm Build Errors from Missing Environment Variables
How to Stop Chrome from Crashing on Windows 11
Fix Python Requests Timeout Not Waiting Correctly
Troubleshooting Cloudflare SSL Full Strict Failures After Update
Fixing Cloudflare Origin Certificate Errors
VS Code npm Permission Denied Fix
VSCode Terminal Not Opening on Ubuntu: Fixes That Work
Docker Network Not Found & Permission Denied Fix
Nginx Upstream Connection Refused: Causes and Fixes
Docker Network Not Found: How to Fix
Fix npm run build Failure Due to Node Version Mismatch
Resolving npm Build Errors from Missing Environment Variables
How to Stop Chrome from Crashing on Windows 11
Fix Python Requests Timeout Not Waiting Correctly
Troubleshooting Cloudflare SSL Full Strict Failures After Update
Fixing Cloudflare Origin Certificate Errors
VS Code npm Permission Denied Fix
VSCode Terminal Not Opening on Ubuntu: Fixes That Work
Docker Network Not Found & Permission Denied Fix
Nginx Upstream Connection Refused: Causes and Fixes
Docker Network Not Found: How to Fix
Fix npm run build Failure Due to Node Version Mismatch