are your

>
> I think that I need the ldap module für the active directory request, do I
> also need the krb5 module?
>
are you trying to do ad authentication?
if so you don't need ldap module, i needed: winbind, samba, krb5.conf(don't know to which package it belongs),auth_ntlm(again don't know which package it belongs to),freeradius.