Port 88 and 750 closed

Sat May 1 12:15:41 EDT 2010

Hi,
Im just starting with Kerberos 5 and Im wondering that after starting rckadmind and rckrb5kdc that when I check with nmap, there is neither port 88 nor port 750 opened - is this alright ?
In my kdc.conf is a line "kdc_ports = 750,88" undeer [kdcdefaults] and also under the [realms]-definition.
Ports which are open are 
  464/tcp open  kpasswd5
  749/tcp open  kerberos-adm

thanks in advance

gizmo11
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