ORA-27054: NFS file system where the file is created or resides is not mounted with correct options

I have been getting 
ORA-27054: NFS file system not mounted with correct options error when running an EXPDP backup to a NFS mount point. 

The system administrator has not been successful in identifying the cause as it shows that the correct mount point options are being used.

Error :--

ORA-39000: bad dump file specification
ORA-31641: unable to create dump file "/expdir/expdp_backup/possit_fulldb_02032015.dmp"
ORA-27054: NFS file system where the file is created or resides is not mounted with correct options
Additional information: 6

Metalink Doc ID 1518979.1 sets the event 10298, by-passing this check and allows writing to the mount point.

sqlplus / as sysdba

alter system set events '10298 trace name context forever, level 32';