An end user goes to a webpage and receives an unexpected exception page "OCSP Error on server certificate" (Online Certificate Status Protocol)
Tech support information: ssl_server_cert_ocsp_check_failed
The Web Security Service checks validity on all certificates by using OCSP.
If the OCSP provider responds with an invalid or incorrect response then the service denies access to the resource.
Alternatively, contact the resource owner to let them know of the misconfiguration.