Certificate errors: FAQ

Applies to: Internet ExplorerWindows 10Windows 8.1 More

Occasionally you'll get an error message telling you there's a problem with a website's security certificate. A site's certificate allows Internet Explorer to establish a secure connection with the site. Certificate errors occur when there's a problem with a certificate or a web server's use of the certificate. Internet Explorer helps keep your information more secure by warning about certificate errors.

What do certificate errors mean?
Error messageWhat it means
This website's security certificate has been revokedYou shouldn't trust this website. This often means that the security certificate was obtained or used fraudulently by the website.
This website's address doesn't match the address in the security certificateA website is using a certificate that was issued to a different web address. This can occur if a company owns several websites and uses the same certificate for multiple websites.
This website's security certificate is out of dateThe current date is either before or after the time period during which the certificate is valid. Websites must renew their certificates with a certification authority to stay current. Outdated certificates can be a security risk.
This website's security certificate isn't from a trusted sourceThe certificate has been issued by a certification authority that isn't recognized by Internet Explorer. Phishing sites often use fake certificates that trigger this error.
Internet Explorer has found a problem with this website's security certificate Internet Explorer found a problem with a certificate that doesn't match any other errors. It could be because a certificate has been damaged, tampered with, written in an unknown format, or is unreadable. You shouldn't trust the identity of the site if a certificate has this error.