Thanks, for the help. Once I changed 'WED' to a number, the cron works as it should. As for my problem, I believe the server locking up is caused by bad RAM. When I check the log of the management port of the server, I noticed that each time it locked up there is a "Correctable Memory ECC" event with one of the sticks of RAM. I'm ordering more sticks to replace the one that's triggering the log event and to have a few spares on hand.