Not binding port 88

[Sture]

Hello! i have just installed Kerberos and i have a small problem.

I have these two running.
/usr/krb5/lib/krb5kdc
/usr/krb5/lib/kadmind

But still no listner on port 88 (or 750)

And in my kdc.conf i have

[kdcdefaults]
        kdc_ports = 88,750
Is there something else i have missed to configure?

Many Thanks

Sture