## To disable CIFS Null Sessions (no data mover reboot is required)  [nasadmin[NAME] ~]$ server_param server_2 -f cifs -modify nullSessionNotOnFS -value 0 server_2 : done  ## To check current parameter value  [nasadmin[NAME] ~]$ server_param server_2 -f cifs -info nullSession server_2 : name                    = nullSession facility_name           = cifs default_value           = 1 current_value           = 0 configured_value        = 0 user_action             = none change_effective        = immediate range                   = (0,1) description             = Allows Null Session connection to share   The parameter cifs.nullSession allows client to use Null Session (no username, no password) to connect to a share. By default, user will be able to login, but not read/write on the File System. The mapped UID for such user is -2 value. param cifs nullSession=0 prevents clients from connecting to a share when using Null Session. param cifs nullSession=1 allows clients to connect to a share without username and password.  Please also refer to cifs.nullSessionNotOnFS parameter.
How to disable CIFS Null Sessions on VNX FILE or Celerra?
How to disable CIFS Null Sessions on VNX FILE or Celerra?