[Dovecot] Troube with GSSAPI auth

[asd dsa]

Hi all. 
I have a troube with GSSAPI (Dovecot 2.0.7) auth:

auth: Debug: client in: AUTH        1       GSSAPI  service=imap    lip=192.168.1.56        rip=192.168.1.2 lport=143      $
auth: Debug: gssapi(?,192.168.1.2): Obtaining credentials for imap@
auth: Info: gssapi(?,192.168.1.2): While acquiring service credentials: An invalid name was supplied
auth: Info: gssapi(?,192.168.1.2): While acquiring service credentials: Unknown code krb5 216

Kerberos key imap/hostname at REALM installed, dovecot.conf:

auth_debug = yes
auth_krb5_keytab = /etc/krb5.keytab
auth_mechanisms = gssapi
disable_plaintext_auth = no
first_valid_uid = 1
log_path = /var/log/dovecot.log
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_gid = 89
mail_location = maildir:/var/spool/mail/%n
mail_privileged_group = mail
mail_uid = 89
service imap-login {
  inet_listener imap {
    address = *
    port = 143
  }
}
ssl = no
userdb {
  driver = static
}

Any ideas?