Problem with Website's security certificate

This is a client browser message. The bowser is not trusting the certificate the BIG-IP is presenting for the service. (assuming you are terminating the ssl on the BIG-IP).

You can check the reason for the message by clicking the "more information" link and then resolve the issue.

If you have an official certificate on the BIG-IP, typically the issue may be expired certificate, missing intermediate certificate or certificate is not for the service the BIG-IP is publishing.

If you have a self-signed certificate on the BIG-IP, then this message is normal.

Either correct the problem with installing a valid/official certificate in the BIG-IP end, or add an exception on the client browser.