sshd no longer accepts connections

["Rob B" <robbyrnes@ozemail.com.au>]

Hi all,

I upgraded Openssh to ssh_1.2.3-9.2_alpha.deb recently, and it now no longer
accepts connections.  I have read the manpage and everything seems to be in
order, but I get the following message from the client (PuTTY):

"Unable to open connection: Protocol initialisation error"

On the server, the message in /var/log/auth.log is:

"Refused connect from 192.168.100.11"

in /var/log/syslog there is a PAM error:

"    : PAM (other) illegal module type: sesion"

The same entry with an idential timestamp is in /var/log/user.log.

Any thoughts?  I'm stuck.

Cheers,
Rob