Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

View list

Fix 'Port Already in Use' Error When No Process Shows

You try to launch Chrome or a Chrome-based tool (like Puppeteer, Selenium, or a local dev server)...

Fixing 504 Gateway Timeout from Windows Update with Proxy

If you see a "504 Gateway Timeout" error when running Windows Update, and your system uses a prox...

How to Fix Windows Search Not Indexing Files

If you type a file name into the Windows Search box and nothing shows up, or results are missing ...

Fixing Windows Defender Dependency Conflict After Update

After a Windows update, you might see errors about a dependency conflict with Windows Defender. T...

Fix Windows Activation Command Error 0x80070002

When you try to activate Windows using the command line—for example, running slmgr /ato

Fix Windows Activation Error 'Permission Denied' in Command Line
When you try to activate Windows using the command line (slmgr.vbs or slui.exe) and see 'Permissi...