Checklists for software errors, setup, and tool workflows.

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Fix Nginx 502 Bad Gateway with Docker Socket

You have an Nginx container proxying requests to another container via the Docker socket, and you...

Fix Node.js Heap Out of Memory When Loading Modules

If you see FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaS...

Fix Nginx Permission Denied Error for www-data User
If you see errors like nginx: [emerg] open() "/var/www/html/index.html" failed (13:...

Python Virtual Environment Not Activating on Ubuntu: Fixes
You've created a Python virtual environment on Ubuntu, but when you run source venv/bin...

Windows Security App Not Opening: Practical Fixes
If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...

Fix Git SSL Certificate Error: Unable to Get Local Issuer Certificate
When cloning or pulling from a Git repository, you may see:
fatal: unable to access...

Checklists for software errors, setup, and tool workflows.

Latest checklists

Fix Nginx 502 Bad Gateway with Docker Socket

Fix Node.js Heap Out of Memory When Loading Modules

Fix Nginx Permission Denied Error for www-data User

Python Virtual Environment Not Activating on Ubuntu: Fixes

Windows Security App Not Opening: Practical Fixes

Fix Git SSL Certificate Error: Unable to Get Local Issuer Certificate

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