Some edits and expansion on my previous attempt to post...

Free IPA 4.4.3
Mac OSX 10.12

Thanks for all the hard work on this, I've been enjoying an almost functional setup for the last week but have been tearing my hair out with making GSSAPI  behave.

What I have found so far using the config instructions - may be error prone now as the number of combinations tried!

Anonymous bind enabled on freeipa: Works If you also specify a real user in the Directory Utility auth 
RootDSE only enabled on freeipa    : Works If you also specify a real user in the Directory Utility auth section (not a service account)
No anonymous binds                        : Will not play at all.


Now the thing that is really throwing me, is that GSSAPI ldapsearch works just fine from the command line (using -Y GSSAPI) but  directory utility seems unable to use these credentials.
I'm totally unsure if this is an OS limitation (as the login screen wouldn't have any creds until a user has typed them) or if I've managed to screw something up.
From browsing my LDAP access logs it looks like only conventional binds are attempted regardless. On the mac side it did until recently still mentions GSSAPI attempts (when anonymous LDAP is disabled) although these couldn't be found int he LDAP log.  It feels like the Mac client is unable to work out how to present the krb credential due to a mapping issue or DNS discovery issue (both my IPA servers have RDNS entries).

Other notable log entries on the Mac side are " failed to retrieve password for credential", and "failed to retrieve server schema". These both occur under the rootdse only ldap config.

I'd like to be in a position where I can either have a very reduced access LDAP user enabled on all Mac clients, or that they can harness the host or user keytab in order to require no special LDAP credentials of their own.

Most of all I suppose I want to know what should work, or be workable!

Hope this makes sense, and thanks in advance,

David

p.s. I'm still not sure if I've managed to join this list, so subject to moderation, and I might require an explicit reply to in order to get responses!