What Am I Using?
Browser showing a certificate warning?
Check whether the warning affects one site or several, and compare the address, device clock and network without bypassing the warning.
Does the warning appear on several familiar sites?
Close the warning page without continuing. Compare two familiar public sites using their normal addresses.
Device and operating system
Verify the address and tell the site owner
An incorrect hostname or a site’s certificate configuration can cause a warning on one address.
- Type the known address yourself. Check the name before entering any information.
- Send the site owner the public hostname, error code and time through a known support channel. Use the public checker for an additional view if appropriate.
Check the clock and the network
An incorrect clock, captive portal or managed network can affect several HTTPS connections.
- Verify the date, time and time zone. Use the network’s normal sign-in instructions on public Wi-Fi.
- If this happens on a managed device, report it to IT. Leave certificate and security settings unchanged.
Record the warning for support
The exact error identifies which part of the connection the browser could not verify.
- Record the error code and public hostname without including private links.
- Use another trusted device or connection to contact the website owner or IT.