How to Fix Nginx 'Upstream Connection Refused' Error
When Nginx returns a 502 Bad Gateway with upstream connection refused in the error l...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listCloudflare Wildcard Subdomain Troubleshooting Checklist
When you set up a wildcard DNS record (e.g., *.example.com) in Cloudflare, subdomain...
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...
Fix Cloudflare 522 Error: Increase Timeout Settings
If you see a Cloudflare 522 error, it means your origin server took too long to respond to Cloudf...
Windows 11 Blue Screen After Update: Hardware Issue Fixes
You updated Windows 11, and now you get a blue screen. If the error mentions hardware, it's o...
Fix VS Code IntelliSense Not Working in Remote SSH
You connect to a remote server via VS Code Remote SSH, start editing code, and notice IntelliSens...
Topic paths
Quick titles
VS Code Git Permission Denied FixHow to Troubleshoot Cloudflare Origin CertificatesHow to Fix ERR_NAME_NOT_RESOLVED with Google DNSHow to Resolve Firefox SSL Error After UpdateHow to Fix nginx upstream connection refused on localhostResolving Git's 'Unable to Get Local Issuer Certificate' SSL ErrorFix Detached HEAD in Git Without Losing WorkDocker Permission Denied on Pull: Solutions