I have had the same issue as this in a Windows 2003 SBS Domain using Samba Version 3.0.14a-Debian.
Under this weblink do a search for 0x19 http://www.microsoft.com/technet/prodtechnol/windowsserver2003/technologies/security/tkerberr.mspx#EDAA Microsoft recommends updating to the latest version of MIT Kerberos I downloaded, compiled and installed krb5-1.4.1 from http://web.mit.edu/kerberos/www/dist/ and it appears to have stopped the error. I will have to check my logs in the coming days because this fix is very new it may have reduced it or just delayed it. Pre-authentication failed: User Name: linux$ User ID: KK\linux$ Service Name: krbtgt/KK.LOCAL Pre-Authentication Type: 0x0 Failure Code: 0x19 Client Address: 1.2.3.4 -- A billion here, a billion there -- pretty soon it adds up to real money. -- Sen. Everett Dirksen, on the U.S. defense budget -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/listinfo/samba
