What should the security administrator install on the proxy server to avoid HTTPS certificate errors for users?

Installing a self-signed Root CA certificate on the proxy server is essential for avoiding HTTPS certificate errors for users. When users connect to the internet through the proxy server, the proxy performs the task of intercepting and decrypting HTTPS traffic. To do this safely and without triggering certificate warnings, the proxy must present a valid certificate to the client.

By installing a self-signed Root CA certificate, the proxy server can act as a trusted intermediary. When users trust this self-signed Root CA by adding it to their trusted root certificate authorities on their devices, they will no longer see HTTPS certificate errors. The browser will recognize the proxy's certificate as valid, enabling secure communication without interruptions.

This solution works especially well in controlled environments, such as corporate networks, where administrators can manage the trust settings on all client machines. It simplifies the user experience while allowing the organization to inspect HTTPS traffic effectively for security purposes.