Cannot resolve network address for KDC in requested realm!

[Amir Saad]

i use Heidmal Kerberos 5 , Cyrus-SASL 2.1.19 , Fedora 4
i'm trying to run the sample-client but i got the following response:
********************************************************************************************************************************************
Waiting for mechanism list from server...
S: QU5PTllNT1VTIExPR0lOIFBMQUlOIERJR0VTVC1NRDUgT1RQIEdTU0FQSSBDUkFNLU1ENQ==
recieved 52 byte message
Forcing use of mechanism GSSAPI
Choosing best mechanism from: GSSAPI
lt-sample-client: SASL Other: GSSAPI Error: Miscellaneous failure (Cannot resolv
e network address for KDC in requested realm)
error was SASL(-1): generic failure: GSSAPI Error: Miscellaneous failure (Cannot
 resolve network address for KDC in requested realm)
lt-sample-client: Starting SASL negotiation: generic failure
****************************************************************************************
where is the error ? , i hope u can help
thanks
Amir Saad
Software  Engineer