Version 1.6.3

krb5.conf:
[libdefaults]
dns_lookup_kdc = true
dns_lookup_realm = true

[realms]

[logging]
        kdc = FILE:/var/log/krb5/krb5kdc.log
        admin_server = FILE:/var/log/krb5/kadmind.log
        default = SYSLOG:NOTICE:DAEMON

If I call kadmin -s <servername> with the krb5.conf above I got the 
following error:

Authenticating as principal root/admin@HACKWEEK.SITE with password.
kadmin: Missing parameters in krb5.conf required for kadmin client 
while initializing kadmin interface

The DNS setup is correct. The error happens at the following place in 
the code:

src/lib/kadmin5/client_init.c: _kadm5_init_any() is called
kadm5_get_config_params() is called successfull and the the 
REQUIRED_PARAMS check indicate that all required params are available.

Then kadm5_get_init_creds() is called. Inside of this function 
kadm5_get_admin_service_name() is called only with the realm as 
parameter.
This function failed, because it calles internally 
kadm5_get_config_params() but this time without the servername from 
the commandline. 

The result is, that if you want to use kadmin, you must configure the 
admin_server in /etc/krb5.conf. Adding the servername via the 
commandline does not work.