Fix Nginx Upstream Connection Refused Socket Error
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 with Docker Socket
You have an Nginx container proxying requests to another container via the Docker socket, and you...
Fix Nginx Redirect Loop After SSL Certificate Install
You installed an SSL certificate, and now your site redirects in a loop. The browser shows 'E...
Fix Windows Defender Real-Time Protection Stuck Off in Windows 11
You open Windows Security, see real-time protection is off, click the toggle, and it turns back o...
Windows Security App Not Opening as Administrator: Fixes
When you try to open the Windows Security app and it fails to launch, often with no error message...
Fix Nginx Configuration Test Failed: Duplicate Listen Error
When running nginx -t to test your configuration, you may see an error like "...
Topic paths
Quick titles
Docker No Space Left on Device Error: Fix GuideWindows RDP Connection Error: Causes and FixesHow to Fix Windows Update Error 0x80070002 in Windows 11Git Push Rejected Non Fast Forward: How to FixNginx Permission Denied Troubleshooting UbuntuResolve Nginx Permission Error on Unix SocketHow to Stop Chrome Black Screen When Playing VideosFix SSH Key Timeout When Cloning Git Repos