Permissions problem with cifs.mount

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http://www.unix.com – hi, I have the following permission problems with cifs.mount : a share on a VNXe (EMC NAS) is accessed by two RHEL 5.9 accounts (authenticated by Active Directory); One account has read+wite permission to the share , the second one has only read permission. Both accounts uses the following mount command: mount -t cifs --verbose -o sec=krb5,cifsacl,multiuser //NAS/share/mount_point First, the multiuser option is rejected (but the mounting is done). Moreover both accounts can write to the share, ignoring the NTFS permissions. What is going on ? (HowTos)