That's normal. A NDMP device has not the Netbackup client installed
You can check connectivity by issuing this command : set_ndmp_attr -very {filer_name} (Use "set_ndmp_attr -list" if you are unsure of the same )
The command should output something like this:
Connecting to host "ns80-9m-01-nn01" as user "ndmp"...
Waiting for connect notification message...
Opening session--attempting with NDMP protocol version 4...
Opening session--successful with NDMP protocol version 4
host supports TEXT authentication
Logging in using TEXT method...
Host info is:
host name "server_2"
os type "DartOS"
os version "EMC Celerra File Server.T.5.6.44.4"
host id "abc1997"
Login was successful
Host supports LOCAL backup/restore
Host supports 3-way backup/restore
If it succeeds, then I would presume everything is O.K.