Not seeing iscsi luns, tying to add storage

I am newish to the whole vmware/iscsi thing but got it to work once.

Environment:

HB BL460c (32gb ram, 2 x 146gb local SAS HD, nc382m HBA)

vSphere ESXi 5.1

MSA2012i (12 x 1TB HD)

I created a vswitch (VMkernel Port) for port1 of the nc382m (vmnic2) and then added the virtual iscsi adapter to connect them.  A re-scan an I was able to add the available lun on the MSA as storage on the esxi host.  All was well.

But, I have created a second lun on the MSA (it is shared to all hosts) and I have re-scanned on the esxi but when I try to add storage no luns are listed.  I followed the same procedure as the initial setup which worked fine and now no joy.  I have searched the forums for ideas but so far non seem applicable, since I was able to do this for one lun but now can add a second lun.

Regards,

Marshall.