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Questions about a lab, a bug, or something you want that is not here yet. Every message is read, and the reply goes to the address you give.

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Faster than a form

Stuck on a lab

The workspace has a Troubleshoot tab that runs a health check and tells you what is wrong and why — usually faster than waiting on a reply.

A command was refused

Press ? at the prompt. It lists exactly what is valid in that mode, on that device.

You think it is a bug

Open test-engine.html. If an assertion is red, quote it — that turns a report into a fix.

Security reports

Use the form with A security issue selected. Tell us what you can reach that you should not be able to, and how you got there. Please do not test against anybody else’s account or data.

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Your name, address, phone number and anything you attach go to the people who run this site, and are used to answer you. Nothing here is advertising and nothing is sold. See the privacy notice.