Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Nginx 502 Bad Gateway: Upstream Connection Refused
If you're seeing a 502 Bad Gateway error with "upstream connection refused" in your N...
Windows Security App Not Working After Reset? Try These Fixes
If you recently reset your Windows PC and now the Windows Security app won't open, shows a bl...
Fix Node.js Heap Out of Memory When Processing Large JSON Files
If you're seeing FATAL ERROR: Ineffective mark-compacts near heap limit Allocation fail...
Node.js Heap Out of Memory vs Stack Overflow: Key Differences
When a Node.js process crashes with an error, you might see either heap out of memory
Fix Windows 11 WiFi Connected but No Internet: IPv4 Settings
You see the WiFi icon connected, but websites won't load. The network shows “No internet” or ...
Topic paths
Quick titles
Fix Cloudflare 522: Steps for Origin Server TimeoutDocker Context Canceled: Fix with .dockerignoreFix Black Screen in Chrome on macOSChrome Access Violation: Extension Conflict GuideHow to Rebuild Search Index in WindowsTroubleshoot Python Virtual Environment Not Working: Practical FixesDetached HEAD in Git: Step-by-Step RecoveryFixing pnpm EINTEGRITY Integrity Check Failures