I installed duo to a bunch of new unix systems the other night and now I am discovering that all of them are failing to let me in. I’m currently experimenting with login_duo (yes I know I should switch to pam, avoid that for now) and it appears SSH let’s me in and then the call to /usr/sbin/login_duo does nothing. If I manually run login_duo from the command line it returns nothing.
How do I figure what’s failing here? It was all working the other day. In fact, a server I setup 3 YEARS ago is suddenly not working either. I’m having a hard time finding anything in any logs to show me what to look at.