So I have a server, and every time a user or service account logs on to the machine, an error event is generated in the System log:
A Kerberos Error Message was received: on logon session DOMAIN\serviceaccount Client Time: Server Time: 12:44:21.0000 10/9/2012 Z Error Code: 0x19 KDC_ERR_PREAUTH_REQUIRED Extended Error: Client Realm: Client Name: Server Realm: DOMAIN Server Name: krbtgt/DOMAIN Target Name: krbtgt/DOMAIN@DOMAIN Error Text: File: e Line: 9fe Error Data is in record data.
So of course I Googled this, and the only information I'm getting for it is that "it doesn't necessarily indicate a problem and you can usually ignore it."
Well, gee, that's great, but these errors are spamming my System log about once a minute and I'd really like to make them stop. Any ideas?
From the Microsoft AskDS blog:
If you see this error in the trace, it does not indicate there is a problem at all. The client requested a ticket but did not include the pre-authentication data with it. You will typically see the same request sent again with the data and the domain controller issuing the ticket. Windows uses this technique to determine the supported encryption types.