Checklists for software errors, setup, and tool workflows.

How to Fix Nginx Upstream Connection Refused Error

If you're seeing upstream connection refused in your Nginx error logs, it usuall...

Fix Nginx Configuration Test Failure After SSL Setup

You've just added SSL certificates to your Nginx server block, but nginx -t retu...

Fix 'git pull failed index.lock file exists' Error

When running git pull, you may see an error like:

fatal: Unable to create &#...

Fix Chrome Certificate Error: Invalid Authority with Proxy Settings

You open Chrome and see NET::ERR_CERT_AUTHORITY_INVALID on every site, even trus...

Fix Chrome Black Screen During Videos: Hardware Acceleration

If you're watching a video in Chrome and the screen goes black (but audio continues), hardwar...

How to Fix Windows Update Service Not Running After Update

After a Windows update, you might find that the Windows Update service itself stops working. This...