I am trying to get a deeper understanding how services are organized. When browsing the LDAP directory in FreeIPA I can see that services are organized in a separate (DN: cn=services,cn=accounts,dc=linux,dc=mydomain,dc=at) and that each services connection to the computer object can be found in the ManagedBy attribute. So far, so good.

In the Windows world I see services specified directly in SPN attributes of a computer object. That makes sense and looks very similar to the IPA world.

What I do not completely understand is why SPNs cann also be specified as an attribute of an AD (service account) user. Why? What's the purpose of that? (almost every tutorial on the web uses the mapuser-parameter of the ktpass command but none states why this is needed.) I can imagine that it makes sense for Linux servers when there is no computer object in the AD. But what are other reasons/use cases?

I do know that this question is slightly off-topic. Nevertheless, I am sure somebody here has a good answer to it which I would highly appreciate to hear.

Cheers,
Ronald
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