10.4.2 Open directory server locks up

Hi, Starting a few days ago, our open directory server locks up and will not start some new processes. I cannot log into it via ssh, but if I already have an ssh session running I can run top (no load problems) and run some commands (e.g. top). I could not run screen which starts up a new session. The only fix we have found is to cycle power (not acceptable). Any ideas are most welcome. The main item in the log files is: Sep 30 14:58:46 od1 /usr/sbin/PasswordService: client response doesn't match what we generated Sep 30 15:07:29 od1 kernel[0]: arp: 10.1.247.54 moved from 00:30:48:2d:b9:07 to 00:30:48:2d:b9:06 on en0 cheers, ski ski@nsd.org Northshore School District