Certificate errors occur when there is a problem with a certificate or the server's use of the certificate. There are various types and causes of certificate error messages and certificate security alerts. For example if the system time (clock) is not correct it can cause certificate warnings so be sure to check that as a first step in investigating the error as NickAu1 suggested.
About certificate errors: WIndows 7About certificate errors: Windows VistaCertificate FAQs: WIndows 7Certificate FAQs: WIndows VistaInternet Explorer Certificate Errors FAQsThere is a problem with website's security certificate when you visit a secured website in Internet Explorer
Why do certificate errors occur?
How do I know there is a certificate error?
Can I go to a website that has a certificate warning?
Can I turn off certificate checking?
I'm getting errors on websites I always visit. What should I do?
Is it ever safe to ignore a certificate warning and continue to a website?
What about expired certificates? Is it okay to go to a website with an expired certificate?
What do the different certificate errors mean?
The following table contains a list of common certificate errors and information about what they mean.
This website’s security certificate has been revoked.
This website’s address does not match the address in the security certificate.
This website’s security certificate is out of date.
This website’s security certificate is not from a trusted source.
Internet Explorer has found a problem with this website’s security certificate.
Common HTTPS Secure Server (SSL) Certificate Errors
Information you exchange...there is a problem with the site's security certificate.
The security certificate was issued by a company you have not chosen to trust.
The name of the security certificate is invalid or does not match the name of the site.
The security certifcate has expired or is not yet valid.
This page contains both secure and nonsecure items.
* There is a problem with the site's security certificate warning
* Secure and NonSecure Items Warning Message
In general, any website that wants to secure their site or some of it's pages with Secure Sockets Layer (SSL)
must obtain a valid certificate from a trusted third party Certificate Authority (CA)
. A server certificate is used for authentication. There are many different types of certificates and separate certificates for every browser. Web browsers include a number of "root certificates", which belong to CAs and are distributed with 'trust bits' set by default. Browser manufacturers choose whose root certificates to include. A number of well-known CAs, such as Verisign and Geotrust, have their root certificates in all major browsers.
With Microsoft, certification authority providers are required to complete a WebTrust for Certification Authorities audit or provide an equivalent third-party attestation. See Windows Root Certificate Program Members List
. All new root certification authorities for Windows are made available to end users through the Windows Update Certificate Trust List (CTL). The Update Root Certificates component
in Windows is designed to automatically check the list of trusted authorities on the Microsoft Windows Update Web site when this check is needed by a user’s application. This provides maximum flexibility for CA providers and Microsoft to respond immediately in the event of an unforeseen security issue. Some anti-virus vendors require the installation of the Microsoft Root Certificate update before allowing installation.
If you try to enter a secure website that uses an expired certificate, you will get a secure website warning such as The certificate for "whatever.com" expired date/time GMT. The webmaster should update the certificate(s)
. When you try to view something on a secure server and get such a message this means you need to download a new certificate. If you choose to agree to accept this certificate you will be able to enter the secure site, providing it is a secure and valid site, and not an exploit or a redirected malicious site.Useful links to learn more about Certificates and how they work