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.
|Error message||What it means|
|This website's security certificate has been revoked||You shouldn't trust this website.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 certificate||A 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|This website's security certificate is out of date||The current date is either before or after the time period during which the certificate is valid.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 Outdated certificates can be a security risk.|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 source||The 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.|