To prevent certificate error warnings when using deep content inspection with the HTTPS proxy, what must you do?

To prevent certificate error warnings when using deep content inspection with the HTTPS proxy, it is necessary to export the proxy authority certificate from the Firebox to all client devices. This is essential because when the Firebox inspects HTTPS traffic, it acts as a man-in-the-middle, effectively decrypting the SSL traffic. In doing so, it generates a new SSL certificate for the session, which clients must trust to avoid receiving warnings about untrusted certificates.

By exporting the proxy authority certificate and installing it on client devices, you ensure that those devices recognize the certificate as valid. This recognition eliminates warnings and maintains a seamless browsing experience for users. Without this certificate being trusted on client devices, any interception of HTTPS traffic by the Firebox would be flagged as suspicious, leading to potential user concern and disruption to services.

The options addressing SSL inspection being disabled, using a self-signed certificate, or changing browser proxy settings would not effectively handle the certificate warning issue in the context of deep content inspection. Each of those alternatives either does not provide a solution for the required trust relationship or compromises the intended functionality of HTTPS inspection. Thus, exporting the proxy authority certificate is the correct and necessary action to ensure smooth operation without security warnings.