You would need to give AD server host name and port umber where it runs.
Simple bind/GSS api bind - your AD team would be able to give you the answer
User principle name - you need to mention a generic username here which is created in AD server. with the same principle name , get the keytab created and upload it here.
Please update here how it goes.
I encourage you to explore the Red Hat Identity Management Server.
It is a yum install, and will smoothly integrate with Windows A/D, provide kerberos, and several other tools nicely integrated in one browser-based management/user interface. All Mac and Linux servers should be configured to use that and l you will be happy when everything works as smoothly (and without the need to regularly re-bond each individual Linux server to Windows A/D.
Avoid a lot of frustration and future aggravation. . . use the RedHat Identity Management Server . . . it's free and the documentation is excellent.