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 notesFix Git 'index.lock file exists' Error
When you see the error fatal: Unable to create 'path/.git/index.lock': File exists....
How to Use a Cloudflare DNS Propagation Checker Tool
After you change a DNS record in Cloudflare, it takes time for the update to spread across the in...
Fix Docker Compose Environment Variable Not Set on Build
You've defined environment variables in your docker-compose.yml under envi...
Fix Nginx 502 Bad Gateway with Docker Socket
You have an Nginx container proxying requests to another container via the Docker socket, and you...
How to Reset Windows Defender Real-Time Protection
Windows Defender real-time protection can sometimes get stuck, fail to turn on, or stop respondin...
Issue queue
SitemapWindows 11 Chrome Startup Crash: Troubleshooting Guide
Chrome Black Screen After Disabling Hardware Acceleration Fix
Docker Engine Startup Checklist
Using nvm to Switch Node Version for a Specific Package
Checklist: Windows Defender Real-Time Protection Issues
How to Fix Activate Command Not Found in Python Venv
How to Update Node Version for Package Compatibility
Fix Chrome Sync Not Working with Family Link
Git LFS Configuration for Large Binary Files
VS Code PowerShell Scripts Blocked – Quick Fix
Python Command Not Found on Windows? Fix It Here
Cloudflare Origin Certificate Troubleshooting Steps
Chrome Black Screen After Disabling Hardware Acceleration Fix
Docker Engine Startup Checklist
Using nvm to Switch Node Version for a Specific Package
Checklist: Windows Defender Real-Time Protection Issues
How to Fix Activate Command Not Found in Python Venv
How to Update Node Version for Package Compatibility
Fix Chrome Sync Not Working with Family Link
Git LFS Configuration for Large Binary Files
VS Code PowerShell Scripts Blocked – Quick Fix
Python Command Not Found on Windows? Fix It Here
Cloudflare Origin Certificate Troubleshooting Steps