Can't get public-key authentication to work

I've been using public-key authentication routinely for a LONG time, from Windows and Solaris and Linux boxes to Solaris, Linux, and some FreeBSD boxes. Usually it's a snap to set up; the one difficult thing is figuring out what that particular distribution and sysadmin has required for protection on the home directory, .ssh directory, and authorized_keys file.

It looks like it should be a snap on FreeNas 9.2.1; I should be able to just paste the public key into the field in the user dialog...

Can't get public-key authentication to work