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 listDebugging Nginx Redirect Loops: Step-by-Step Guide
You try to load a site and the browser keeps spinning or shows 'ERR_TOO_MANY_REDIRECTS'. ...
Node.js Heap Out of Memory Troubleshooting Checklist
When a Node.js process crashes with FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - Ja...
VSCode IntelliSense Not Working for JavaScript: Fixes
You open a JavaScript file in VSCode, but IntelliSense is silent — no autocompletions, no suggest...
How to Fix a Detached HEAD in Git Using SourceTree
If you open SourceTree and see a message like “You are in ‘detached HEAD’ state,” it means your w...
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...
Topic paths
Quick titles
Poetry Lock File Conflict Resolution GuideNginx Redirect Loop Troubleshooting Guidepip Externally Managed Environment Fix GuideWhy Docker Container Exits Right After StartHow to Fix DNS_PROBE_FINISHED_NXDOMAIN Error in EdgeFixing Python pip Dependency ConflictsGit Unable to Get Local Issuer Certificate FixWindows 11 Update Blue Screen Error Code Fix