2012-06-24 06:45 PM
I would check "cifs domaininfo" to see if the controller sees the domain... you can also "cifs testdc" to test the domain controller connections. It could be a lot of things... I would also check time but at the same time every day it isn't likely the time is off by over 5 minutes only once a day at the same time every day. Do you have a case open?
2012-06-25 06:24 AM
Please firstly look if there is any network issues or check the Domain connectivity connection is live on that particular time and also open case and generate the autosupport logs to review them.