Users report the following message appears when browsing to the company's secure site: This website cannot be trusted. Which of the following actions should a security analyst take to resolve these me

An expired SSL/TLS certificate invalidates the server's identity, preventing browsers from establishing a secure connection and leading to 'This website cannot be trusted' warnings because the certificate's validity period has passed.

The file extension of a certificate (.pfx, .cer, .crt) on the server is an implementation detail for storage or import and does not inherently affect whether a client trusts the certificate or not.

Browsers must validate a website's SSL/TLS certificate by tracing its chain of trust back to a trusted Root Certificate Authority (CA) installed in the client's certificate store. If the necessary root certificate is missing or outdated on the client, the browser cannot establish trust and displays a security warning.

While a private key is essential for SSL/TLS, the 'This website cannot be trusted' message specifically indicates issues with the public certificate's validity or chain of trust, not primarily the private key's currency or presence as long as a valid key pair exists.

Clearing browsing history or cache typically resolves client-side rendering or session issues but has no impact on server-side SSL/TLS certificate validity or the client's ability to trust a certificate chain.