It sounds as though the Tableau Server Run As User account cannot query the Active Directory. This is a very important part of using Active Directory with Tableau Server and kerberos.
If the Run As User account cannot query the Active Directory, it cannot query Active Directory for users. This will cause authentication to fail. In regards specifically to kerberos, it will prevent the creation of the kerberos ticket and cause a failure to authenticate.
Run As User: Run As User
Kerberos Requirements: Kerberos Requirements
If additional assistance is required beyond the above, it may be necessary to create a case with Tableau Support. The Tableau Server logs will be necessary to address the concern.
I hope this helps!
Thank you for your reply.
We have been through those links, my confusion point is that if the Run as user didn't have permissions to query the AD ,my AD authentication wouldn't have worked at all. But my AD Authentication works very well, it is Kerberos that isnt working
Although thanks for your reply and we have raised the case for the same.