We have begun having the issue listed previously by Leen Toelen. When the machine is rebooted, we can no longer authenticate to our W2K server. Net join works fine, wbinfo -t shows succeeded, but wbinfo -u returns error looking up users. Absolutely nothing has changed in the last three weeks, but we are having this problem now. I looked at Kevin Wilson's information about the MS security patch, but our problem doesn't sound the same, we cannot even get the SID just a straight up error. Any and all help is greatly appreciated. thanks Jeff Soward IT Manager Climatemaster Inc. Oklahoma City, OK Office 405-745-6000 ext.256 Mobile 405-408-6828 "Why is this thus? What is the reason for this thusness?" ~ Artemus Ward