What does Your connection is not private mean?

Chrome's full-page warning shown whenever certificate validation fails. It is not a single error — the real cause is the NET::ERR_CERT_* code printed underneath it, and that code tells you which of expiry, trust, or hostname is wrong.

Device-specific

Your connection is not private on Windows

Why it happens on Windows

A drifted system clock or a stale Windows certificate store makes valid certificates fail validation across every browser at once.

The fix on Windows

Settings → Time & language → set time automatically, then run `certutil -urlcache * delete` in an elevated prompt to clear cached revocation data and restart the browser.

Is Your connection is not private happening on your domain?

Running the check from outside your device separates a real certificate problem from a local clock or network issue in one step.

Free, no signup. Runs from outside your network, which is the only way to tell a server fault from a local one.

If that didn't fix it

Windows has its own failure mode, but Your connection is not private has a wider set of causes that apply everywhere. The most common one overall is: the certificate expired (net::err_cert_date_invalid).

All causes and fixes for Your connection is not private

Your connection is not private on other platforms and devices

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Last verified: 16 October 2026 by the Lemwatch research team.