problem with connection to kdc

[Jan Kowalski]

Hello!
I'm student of Technical University of Opole and I'm making 
Kerberos realm for my
 security project.
I have installed Kerberos from source code on the Red Hat Linux 
7.3, edited configuration files, 
created database and succefully
started krb5kdc and kadmind deamons. But now I have a 2 
problems: 

-when I'm trying obtain a ticket using kinit there is a error : 
cannot resolve network adress
for the kdc( I have configured source code with --enable-dns and 
configured my DNS server,the 
necessary ports are opened). When I'm checking my network using 
ping everything is ok.
Maybe i have made something wrong with mapping my hostnames onto 
kerberos realm?

-when I'm trying to obtain ticket on usung host on which I have 
a kdc there is a error that there is no user 
root/admin at grodziec.pl but in kadmin.local when I list 
principals user allreay exist.
I'm sorry for bother you but I'm still rooky with Linux and I 
really don't know what I have
made wrong.
Thanks

There are my conf files:
krb5.conf

[logging]
 default = FILE:/var/log/krb5libs.log 
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log
[libdefaults]
ticket_lifetime = 24000
default_realm = GRODZIEC.PL 
dns_lookup_realm = true
dns_lookup_kdc = true
[realms]
 GRODZIEC.PL = {
 kdc = linuxmaster.grodziec.pl:88
 admin_server = linuxmaster.grodziec.pl:749
 default_domain = grodziec.pl}
[domain_realm]
 grodziec.pl = GRODZIEC.PL
 .grodziec.pl = GRODZIEC.PL
[kdc]
 profile = /usr/local/var/krb5kdc/kdc.conf
[appdefaults]
pam = {
  debug = false
  ticket_lifetime = 36000 
  renew_lifetime = 36000
  forwardable = true
 krb4_convert = false
 }
----------------------------------------------------
----------------------------------------------------
kdc.conf
[kdcdefaults]	
kdc_ports = 750,88
[realms]	
GRODZIEC.PL = {
		database_name 
= /usr/local/var/krb5kdc/principal			        
admin_keytab = FILE:/usr/local/var/krb5kdc/kadm5.keytab
		acl_file = /usr/local/var/krb5kdc/kadm5.acl
	        key_stash_file 
= /usr/local/var/krb5kdc/.k5.GRODZIEC.PL	
	                kdc_ports = 750,88	
	        max_life = 10h 0m 0s	
	        max_renewable_life = 7d 0h 0m 0s
	   }


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