Checklists for software errors, setup, and tool workflows.

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GitLab Runner Stuck Pending After Upgrade: Fixes

After upgrading GitLab Runner, you may see jobs stuck in pending state. This usually happens beca...

Fix Docker Pull Access Denied Error on Windows

If you see docker pull access denied on Windows, Docker Desktop cannot authenticate ...

Fix Windows Defender 504 Gateway Timeout Error

You open Windows Security and see a '504 Gateway Timeout' error. This usually means Windows Defen...

How to Enable UFW for a Specific IP Address

You have a Linux server with UFW (Uncomplicated Firewall) enabled, and you need to allow or block...

Fixing NGINX 502 Bad Gateway Permission Denied

If you're seeing a 502 Bad Gateway error from NGINX and the logs mention p...

Fix Windows Defender Real-Time Protection Grayed Out
You open Windows Security, go to Virus & threat protection, and see that the Real-time protection...