FAS2554 with ONTAP 9 RC1 in a cluster.
We've configured a CIFS svm, configured domain-tunnel and created user logins for both an AD user and an AD group, all for applications ssh, http and ontapi.
Login name created for <netbios>\<username> and <netbios>\<groupname>.
Login works for SSH, but not for http/system manager.
So... is this a known bug in ONTAP 9?
I didn't find anything, but those google skills...
Solved! See The Solution