When connecting to a secured website the following message may appear:

"Revocation information for the security certificate for this site is not available. Do you want to proceed?"

This may occur even if the following settings are disabled under Tools | Internet Options | Advanced | Security:

- Check for publisher's certificate revocation
- Check for server certificate revocation (Requires restart)

The root CA certificate is not installed on the workstation, the CA is not in the list of trusted CA’s, or the CRL can not be contacted.

Check the CRL:

- Navigate to the website
- When the "Revocation information" prompt appears click View Certificate
- Select the Details tab
- Select the CRL Distribution Points field if it exists.
- Copy the CRL URL
- Navigate to the CRL URL e.g. http://crl.thawte.com/ThawteSGCCA.crl
- A prompt to download should appear if there are no issues

Check the Certificate Path:

- Navigate to the website
- When the "Revocation information" prompt appears click View Certificate
- Select the Certification Path tab

If the Certificate Authority has a red cross because it is not trusted:

- Select the Certificate Authority and click View Certificate
- Click Install Certificate
- Click Next on the Certificate Wizard
- Select the Place all certificates in the following store radio button
- Click Browse
- Select the Trusted Root Certificate Authorities store and click OK
- Click Next on the Certificate Wizard
- Click Finish on the Certificate Wizard
- Click Yes to install the certificate
- Click OK
- Close all certificates

Trusted Root Certificate Authorities can be added per computer using the following Group Policy:

- Computer Configuration | Windows Settings | Security Settings | Public Key Policies | Trusted Root Certification Authorities

Wrong Message Appears When You Visit a Secure Web Site Whose CDP Is Unavailable
http://support.microsoft.com/kb/308087