I have noticed that when I enable FreeIPA all my CentOS 7.x boxes work via SSH just fine, however none of my CentOS 6 boxes work. I read that 2FA didn't come until CentOS 7.1. So my question is does 2FA via SSH not work at all if you have a RHEL 6 / CentOS 6 server? Just curious.

Thanks much.

Devin Acosta