I forgot to note that you use “nfsadmin” to enable to mapping.

nfsadmin mapping config addomain=krb1.cs.rutgers.edu
nfsadmin mapping config adlookup=yes

In this case I’m pointing to your KDC. I believe it will work if you use your 
domain name, as long as you have the appropriate DNS entries. I’m hardcoding 
the server because it makes debugging easier.

> On Jan 9, 2019, at 12:24 PM, Charles Hedrick via FreeIPA-users 
> <freeipa-users@lists.fedorahosted.org> wrote:
> 
> We’re in the process of setting up Windows machines to authenticate against 
> IPA and use home directories from our NFS servers with Kerberized NFS. 
> 
> The process is not easy, but possible. One thing I’ve found frustrating is 
> that documentation on Windows NFS is terrible. In particular, when you do a 
> mount, it’s critical to get it mounted with the right UID and GID. The 
> procedure most people are using is to set the UID and GID in the registry. 
> That’s fine if the same person always uses the system, but it won’t work for 
> us.
> 
> In older versions of windows, you could set up 
> /windows/system32/drivers/etc/passwd. But in Windows 10 they no longer seem 
> to pay attention. The only real way to do it is with active directory lookup. 
> Fortunately, IPA can handle that. The query is
> 
> GSSAPI authenticate as machine$
> ldapsearch -Y GSSAPI -b dc=cs,dc=rutgers,dc=edu '(sAMAccountName=clh)’ 
> uidnumber gidnumber
> 
> To get the GSSAPI authentication to work, you need MACHINE$ set as an alias 
> for the host. And you need to configure Windows to use principal 
> canonicalization. Otherwise Kerberos ignores the alias. That means doing 
> "ksetup /setrealmflags DOMAIN ncsupported” on Windows.
> 
> You also need to add samaccountname as an attribute for users, populate it, 
> and make it readable and searchable.
> 
> With this, mapping works.
> 
> Off course this assumes that Windows Kerberos is set up pointing to IPA as 
> the KDC, but there are plenty of other instructions on how to do that.
> 
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