[Dovecot] kerberos trying to obtain credentials for wrong machine

Hi,

I'm currently trying to configure Dovecot to use kerberos. My KDC is Windows 2003 and I successful generated keytab file for Dovecot machine. Problem is when I'm trying to use GSSAPI it told me Obtaining credentials for imap@debian5 - and of course this fails because debian5 isn't KDC, it should look for imap/debian5.inblock.local@INBLOCK.LOCAL. What I'm missing?