Nginx Upstream Connection Refused: Diagnosis and Fixes
When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesHow to Set npm Prefix to Avoid Permission Denied Errors
If you've seen EACCES: permission denied when running npm install -g
Resolving Python Dependency Conflicts in Docker Containers
You build a Docker image, run the container, and Python crashes with an ImportError or a version ...
Fix Node.js Heap Out of Memory in Docker Containers
If your Node.js application running in a Docker container crashes with a "JavaScript heap out...
Fix VS Code Breakpoint Not Hit in Docker Container
You set a breakpoint in VS Code, run your app inside a Docker container, and the breakpoint is ne...
How to Check Docker Disk Space Usage
If you run Docker for a while, you may notice your disk space shrinking. Images, containers, volu...
Issue queue
SitemapWindows Update Error 0x80070002: Network Troubleshooting Guide
How to Fix Port Conflict in Docker Compose on macOS
npm Permission Denied: Quick Fixes for Home Directory
How to Fix npm Package Json Not Found Error
Git Push Rejected Non Fast Forward: Causes and Solutions
Troubleshooting Cloudflare DNS Propagation Delays
Troubleshooting Nginx Upstream Connection Refused
Fix Nginx Configuration Test Failure After SSL Setup
Non Fast Forward Error Troubleshooting
How to Fix ERR_NAME_NOT_RESOLVED in Chrome
How to Resolve Certificate Authority Invalid in Chrome
Creating a Branch from Detached HEAD in Git
How to Fix Port Conflict in Docker Compose on macOS
npm Permission Denied: Quick Fixes for Home Directory
How to Fix npm Package Json Not Found Error
Git Push Rejected Non Fast Forward: Causes and Solutions
Troubleshooting Cloudflare DNS Propagation Delays
Troubleshooting Nginx Upstream Connection Refused
Fix Nginx Configuration Test Failure After SSL Setup
Non Fast Forward Error Troubleshooting
How to Fix ERR_NAME_NOT_RESOLVED in Chrome
How to Resolve Certificate Authority Invalid in Chrome
Creating a Branch from Detached HEAD in Git