Port 22:Connection Refused (SSH login)

We just upgraded our OS X Server from 10.3 to 10.4, and now I can't get in via SSH.

I've tried accessing it from the LAN to make sure it's not some router issue, and looked everywhere I can think of in the Server Admin and Workgroup Manager to make sure SSH is activated. I guess I missed something, but I can't for the life of me figure out what.

Any ideas?