enabling AFP over SSH

Hey all, After years of ignoring it, I'm finally trying to figure out how to get AFP connections over SSH with Tiger Server (10.4.7). I've followed the directions on page 235 of the Tiger Server Security Configuration guide (i.e. "Enable secure connections" is checked in Server Admin -> AFP). The client machine (10.4.8) has got "Allow secure connections using SSH" selected in the AFP login dialog. Nada. I get that old message, "Cannot make a secure connection to Your Really Insecure Server You Should Be Ashamed Of... The server does not support secure connections via SSH. [etc.]" I'm seeing nothing of significance in system.log or secure.log. Tips? Thanks, noam