I've just transitioned my baseline from one set of servers to another, and I'm noticing that some systems will allow me to log in directly from the greeter on workstations while others don't (including my own workstation!).

These methods all work on my workstation:

* ssh @localhost with password prompt * ssh @remote_host with password prompt * ssh @remote_host with PSK * su - user as root (no password prompt)

What could be preventing me from logging in through the greeter (GDM)? Where should I be looking? I've got a workstation that does allow me to log in so comparing to it will be easy, but going file-by-file would take forever.

Thanks!