In the Ubuntu krb5.conf are 2 lines more:
udp_preference_limit = 0
default_ccache_name = KEYRING:persistent:%{uid}

The nameservers on both system types are identical and pointing to our 
AD-Domain Controller.
On the AD-Servers the ipa-domain.com is a conditional forwarder to the 
IPA-Server.

I changed the name server configuration on a CentOS just to be sure, but it 
doesn’t had any effect.

Best regards,
Fabian

> On 15 Dec 2015, at 13:38, Sumit Bose <sb...@redhat.com> wrote:
> 
> On Tue, Dec 15, 2015 at 10:58:09AM +0000, Zoske, Fabian wrote:
>> I’ve setup an IPA-Server with a handful of clients and AD-Trust.
>> The server is a CentOS7.1 with IPA4.1 and the clients are mostly Ubuntu 
>> Server 14.04 LTS.
>> Our IPA-Domain is like ipa-domain.com and our AD-Domain is like 
>> ad-domain.local, but our user principals in AD are 
>> u...@old-domain.com<mailto:u...@old-domain.com> for backward compatibility.
>> 
>> On the Ubuntu clients I can login with my AD-Credentials, but when trying to 
>> do the same on a joined CentOS Server I can’t login.
>> In the logs I can see, that there is no KDC for OLD-DOMAIN.COM is found.
>> 
>> Why does this scenario works on Ubuntu but not on CentOS?
>> Can I do something about this?
> 
> Are there any differences in /etc/krb5.conf on the Ubuntu client and on
> the CentOS servers?
> 
> What name servers are configured? Typically the clients should use the
> IPA server as a name server.
> 
> bye,
> Sumit
> 
>> 
>> Best regards,
>> Fabian
> 
>> -- 
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>> Go to http://freeipa.org for more info on the project
> 


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