I had a WU fail on me today it is the first 1 that has ever failed on that machine. It is running it again and perhaps it will complete it this time. But I was curious at to what would cause the CoreStatus = FF (255) error. I do not recall seeing this error before. The one thing that has changed on this machine is I upgraded from VM 2 to VM 3 today
[21:25:13] Completed 92500 out of 250000 steps (37%)
[21:31:45] CoreStatus = FF (255)
[21:31:45] Client-core communications error: ERROR 0xff
[21:31:45] Deleting current work unit & continuing...
[21:31:59] - Preparing to get new work unit...