NDMP backups from EMC Isilon

Attempting to backup an Isilon system using remote NDMP on Netbackup 7.1 (linux media server writing to Datadomain).  We have port 10000 opened bi-directionally between NAS device and media servers. 

When the backup is attempted, it connects and then hangs:

06/05/2015 16:30:54 - Info bptm (pid=11360) start
06/05/2015 16:30:55 - Info bptm (pid=11360) using 128 data buffers
06/05/2015 16:30:55 - Info bptm (pid=11360) using 1048576 data buffer size
06/05/2015 16:30:56 - Info bptm (pid=11360) start backup
06/05/2015 16:30:59 - begin writing

Are there any other ports that need to be opened?  Anything else I am missing?

Thanks,