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 listFixing NGINX 502 Bad Gateway in Docker Containers
When running NGINX as a reverse proxy in Docker, a 502 Bad Gateway error usually means NGINX cann...
Fix Cloudflare Origin Certificate with Let's Encrypt
If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...
Python Requests: Fixing Connection Timeout with Proxies
You're using the Python requests library with a proxy, and you're seeing a <...
Fix Docker Volume Permission Denied on Linux
When you mount a host directory into a Docker container, you may see errors like Permission...
Fix Docker Pull Access Denied for Private Repository
When you run docker pull for a private repository and get an access denied
Topic paths
Quick titles
How to Resolve Git Detached HEADWindows 11 WiFi Has Internet but Other Devices Work FineTroubleshooting Cloudflare 521 Error: Port 443 BlockedWindows Taskbar Icons Missing? Try These StepsHow to Fix VSCode Rust Language Server IssuesGit Clone Fails with Timeout in VS CodeFix Cloudflare 522 Error with Nginx ConfigurationFirefox DNS Error Troubleshooting Guide