Revocation information for the security certificate for this site is not availabl

a Security Alert is displayed:

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

Then, Yes, No, View Certificate.

solution : Internet Explorer>Tools>Internet Options>Content Tab>Certificates Section>Certificates>Advanced>UnCheck Client Authentication>OK

solution : changed the date on her laptop, advancing it a month. Changing it back solved the problem.

A website's certificate provides identification of the web server. If the certificate has an error, it might indicate that your connection has been intercepted or that the web server is misrepresenting its identity.
Error message: This website’s security certificate has been revoked.
What it means: Do not trust this website. This error message often indicates that the security certificate was obtained or used fraudulently by the website. The encryption key that is specified in the certificate might have been compromised or the user listed in a certificate does not have authority to use it (for example, the company was sold). The certification authority that issued the certificate keeps a list of revoked certificates and that list is checked by Internet Explorer.
If you're using Internet Explorer, then we recommend you to check if proxy server settings are enabled. To do this, try these steps:
Step 1: Disable proxy server on Internet Explorer (IE)
a. Click Start, type inetcpl.cpl and hit enter.
b. Click Connections tab, click LAN settings button.
c. Uncheck "Use a proxy server for your LAN" under proxy server.
d. Click ok to apply the changes.
e. Open Internet Explorer and check if the issue persists.