In Mac OS X v10.6, the man page for krb5.conf states that the order of precedence for Kerberos configuration files is as follows: ~/Library/Preferences/edu.mit.Kerberos /Library/Preferences/edu.mit.Kerberos /etc/krb5.conf? When certain preferences related using DNS to locate Kerberos servers are set, they may not respect the order of precedence for location Kerberos servers.
Source:Mac OS X Server v10.6: Kerberos KDC location specified in krb5.conf is not respected
