Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You have a working internet connection—other sites load, email works—but OneDrive shows a sync er...

When you run an apt command and see a message like Could not get lock /var/lib/dpkg/lock-fr...

Fix PuTTY Connection Refused: Check SSH Service
When you see 'Connection refused' in PuTTY, it usually means the SSH server on the remote machine...

How to Fix Command Prompt Proxy Error
If you get a proxy error in Command Prompt—for example, when running curl, git...

How to Fix SSH Host Key Verification Failed Error
You try to SSH into a server and get a message like WARNING: REMOTE HOST IDENTIFICATION HAS...

Fix Microsoft Teams Stuck on Loading Screen
When Microsoft Teams gets stuck on the loading screen with the spinning dots, it usually points t...