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 Fix Cloudflare 521 Error with Wildcard Subdomains
If you're seeing a Cloudflare 521 error on a wildcard subdomain (e.g., *.example.com), the or...
Resolve Git Merge Conflicts in VS Code: Step-by-Step
When you pull or merge branches in Git and both branches have changed the same part of a file, yo...
Cloudflare 521 Error: Troubleshooting and Fixes
When you see a 521 Web Server Is Down error, it means Cloudflare cannot establis...
Bluetooth Troubleshooting Checklist for Windows 11
Bluetooth on Windows 11 can be unreliable. If your device won't pair, keeps dropping, or does...
Cloudflare SSL Full Strict: Fix Origin Certificate Errors
If you've set Cloudflare's SSL/TLS encryption mode to Full (Strict) and started seeing er...
Issue queue
SitemapHow to Fix Chrome STATUS_ACCESS_VIOLATION Error
Win 11 WiFi Connected But No Internet: IPConfig Release/Renew Fix
Setting a Total Timeout for Python Requests
How to Change Git Remote Origin
Fix Chrome Your Connection Is Not Private Error
Docker Container Exits Immediately After Entrypoint
Resolve Cloudflare 521 Error on Wildcard Domains
How to Resolve Git Push Rejected (Non Fast Forward)
pnpm Store Path Setup Guide
VS Code Git Auth Failed with 2FA: How to Fix
Fix Git Push Non-Fast-Forward and Permission Denied Errors
Adding Python to PATH on Windows 10
Win 11 WiFi Connected But No Internet: IPConfig Release/Renew Fix
Setting a Total Timeout for Python Requests
How to Change Git Remote Origin
Fix Chrome Your Connection Is Not Private Error
Docker Container Exits Immediately After Entrypoint
Resolve Cloudflare 521 Error on Wildcard Domains
How to Resolve Git Push Rejected (Non Fast Forward)
pnpm Store Path Setup Guide
VS Code Git Auth Failed with 2FA: How to Fix
Fix Git Push Non-Fast-Forward and Permission Denied Errors
Adding Python to PATH on Windows 10