The remote host is missing an update to krb4 announced via advisory DSA 184-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20184-1

Tom Yu and Sam Hartman of MIT discovered another stack buffer overflow in the kadm_ser_wrap_in function in the Kerberos v4 administration server. This kadmind bug has a working exploit code circulating, hence it is considered serious. This problem has been fixed in version 1.1-8-2.2 for the current stable distribution (woody), in version 1.0-2.2 for the old stable distribution (potato) and in version 1.1-11-8 for the unstable distribution (sid). We recommend that you upgrade your krb4 packages immediately.