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 Git Clone Connection Timed Out on Windows 10
When you run git clone on Windows 10 and see a connection timed out error, it usuall...
Firefox Secure Connection Failed on All Websites: Fix Guide
If Firefox shows 'Secure Connection Failed' on every website you try to visit, it usually...
Fix ERR_NAME_NOT_RESOLVED in Chrome with Network Reset
When Chrome shows "ERR_NAME_NOT_RESOLVED", it means the browser cannot translate a domain...
Fix VSCode Breakpoints Not Hitting in TypeScript
You set a breakpoint in a TypeScript file, run the debugger, and execution never pauses. This is ...
Fix Docker Compose Port Allocation Errors
When you run docker compose up and see an error like "port is already alloca...
Topic paths
Quick titles
Windows Security App Not Opening on Windows 10: Fixes That WorkHow to Fix Cloudflare Origin Certificate Invalid ErrorHow to Fix VS Code Permission Denied on UpdateEnable Stuck Chrome Extensions: Step-by-Step GuideEdge Sync Setting Not Showing UpFix Git SSL Certificate 'Unable to Get Local Issuer' After UpdateFix Nginx Permission Denied Errors on UbuntuFix 521 Origin Connection Error After Server Update