A z/OS NFS Client Directory Default ACL delete request was attempted but the remote NFS Server is not a z/OS system. Directory Default requests are only supported when the remote NFS Server is the z/OS NFS Server. Otherwise, Default ACLs must be managed using File Default ACL requests. Most non-z/OS platforms only have a single set of Default ACLs, not separate File and Directory Default ACLs. Therefore, z/OS NFS ACL management support uses the File Default ACL requests to manage the NFS Default ACLs. To avoid potential confusion, or even errors due to duplicate requests, Directory Default ACL requests are not supported.