When using cname for a cifs server, does the SPN also need to be registered? Last updated Save as PDF Share Share Tweet Share Views:271Visibility:PublicVotes:0Category:ontap-9Specialty:nasLast Updated: Applies to ONTAP 9 CIFS Answer Yes, SPN must also be registered. Additional Information CIFS/SMB is not accessible because authentication fails when the DNS alias/CNAME is not configured as an SPN