suggestion for locating master kdc logic

Tom Yu tlyu at MIT.EDU
Mon Apr 9 17:36:28 EDT 2012

Sam Hartman <hartmans at MIT.EDU> writes:

> I also think it would be reasonable to consider an argument that the
> default user experience for most installations of MIT Kerberos will be
> improved by falling back to admin_server.  My suspicion as to why we
> decided not to do this is that a lot of people configure AD KDCs as
> admin_servers not kpasswd_servers.

Do you mean in the krb5.conf files, or elsewhere?  I'm not sure it
makes sense to configure AD KDCs in krb5.conf as admin_servers.

> One thing to check here is what AD's default SRV records do in this
> instance. If they publish admin_server records then it's probably not a
> good idea to fall back by default.

I doubt that AD publishes SRV records for "kerberos-adm", since that
port number is meant for the MIT krb5 kadmin RPC protocol.  Based on a
single sample, AD does appear to publish SRV records for "kpasswd".
How would an AD KDC function as an admin_server?

If you meant SRV records for "kerberos-master", AD doesn't appear to
publish those either, and "kerberos-master" is also not registered in
the IANA ports and services registry.

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