Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you try to activate Windows and see error 0xc004c003 with the message "invalid product key,"...

If you're getting a 504 Gateway Timeout when connecting to Remote Desktop Services, the gateway o...

You might see an error saying 'Windows Update auto start failed to start' when you try to check f...

If you see error 407 (Proxy Authentication Required) when using Command Prompt for network operat...

When you open Windows Security (formerly Windows Defender Security Center) and see a 504 ...

Microsoft Teams Crash Troubleshooting Checklist
If Microsoft Teams keeps crashing on you—closing without warning, freezing, or refusing to start—...