IPA Client AD Trust logins fail with Cannot find KDC for realm "AD.REALM" while getting initial credentials

Solution In Progress - Updated -

Issue

  • Unable to login with AD Trust users on IPA clients
  • Succesfully able to resolve SSSD users with id command but login fails during PAM authentication. SSSD krb5_child logs errors out with
Cannot find KDC for realm "AD.REALM" while getting initial credentials
  • The same error can be reproduced with
# kinit aduser@AD.REALM

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Identity Management

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