Techniques for intercept-based multifactor authentication client enrollment as a network service are disclosed. In some embodiments, a system, process, and/or computer program product for intercept-based multifactor authentication client enrollment as a network service includes monitoring a session at a firewall, intercepting a request for access to a resource while monitoring the session at the firewall, determining that a user associated with the session is not enrolled for multifactor authentication, and initiating enrollment of the user for the multifactor authentication.