I am trying to help a friend with some keypair-based login problems,
and am a little stumped!

For quite some time, she had keypair-based logins working for a few
users, but at some point, it stopped functioning. She says that it
probably happened after doing a system update, thus updating the
OpenSSH package. All of the machines in question are running Fedora
Core 2, with OpenSSH 3.6.1p2.

Keypair-based logins *do* work for root, but not for any other user.
I've created test users and set up keypairs all day long, and it works
for *root* on the FC2 machines, but not for regular users. It will,
however, work for regular users on her CentOS 4.3 machines.

Comparing the ssh_config and sshd_config files between machines with
the desired behavior and those without hasn't turned up anything that
would (to me) explain the difference - is there something obvious that
I should be lookin for?

Thanks,

Thomas