Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesHow to Diagnose and Fix Chrome Memory Leaks
If your Chrome browser gradually consumes more and more RAM until pages lag or crash, you may be ...
Fix Windows 11 Update Stuck at 0% with Clean Boot
You start a Windows Update, but it sits at 0% for minutes or hours. This can happen after a faile...
Chrome Sync Not Working After Password Change: Fixes
Changing your Google password can break Chrome sync on all devices. Here's how to get it work...
How to Fix Cloudflare 521 Error Due to Proxy Issues
If you see a Cloudflare 521 error, the message usually says something like “Web server is down.” ...
Firefox Secure Connection Failed Only on WiFi: Fixes
If Firefox shows a "Secure Connection Failed" error only when you're on WiFi—but the ...
Issue queue
SitemapFix Git Push Non-Fast-Forward and Permission Denied Errors
How to Set Environment Variables in Docker Compose
ERR_CONNECTION_RESET Chrome Windows 10 – Step-by-Step Fix
Resolve Cloudflare 522 Timeout Issues
Overcoming 'remote origin already exists' in Git
Resolve npm Build Permission Denied on Linux
How to Fix Nginx 502 Upstream Connection Refused
VS Code Terminal Won't Open PowerShell Fix
Why VS Code Debugger Breakpoints Are Greyed Out and How to Fix
Troubleshooting Windows Update Error 1053
Python Virtual Environment Not Activating on Mac: Fixes
Resolve Cloudflare Wildcard and Root Domain DNS Conflicts
How to Set Environment Variables in Docker Compose
ERR_CONNECTION_RESET Chrome Windows 10 – Step-by-Step Fix
Resolve Cloudflare 522 Timeout Issues
Overcoming 'remote origin already exists' in Git
Resolve npm Build Permission Denied on Linux
How to Fix Nginx 502 Upstream Connection Refused
VS Code Terminal Won't Open PowerShell Fix
Why VS Code Debugger Breakpoints Are Greyed Out and How to Fix
Troubleshooting Windows Update Error 1053
Python Virtual Environment Not Activating on Mac: Fixes
Resolve Cloudflare Wildcard and Root Domain DNS Conflicts