Hallo there everyone

i hope you can help me with my issue cause it really bothers me for a week 

i set up an ldap on gentoo and after modifying heimdal kerberos and tls 
i am stuck to that point:
i get these errors...

additional info: SASL(-13): authentication failure: GSSAPI Failure: gss_accept_sec_context

+

AS-REQ host/proof.teipir.gr@TEIPIR.GR from IPv4:10.0.0.12 for krbtgt/TEIPIR.GR@TEIPIR.GR
2010-03-18T16:32:58 Client sent patypes: none
2010-03-18T16:32:58 Looking for ENC-TS pa-data -- host/proof.teipir.gr@TEIPIR.GR
2010-03-18T16:32:58 No preauth found, returning PREAUTH-REQUIRED -- host/proof.teipir.gr@TEIPIR.GR
2010-03-18T16:32:58 sending 268 bytes to IPv4:10.0.0.12


any ideas what files to check cause i am a bit lost...

Thank you very much