iscsi target is on adata 2TB portable USB drive
It worked initially upon initial setup
The portable drive was disconnected and reconnected
Following re-connection, iscsi target shows status of Error
iscsi initiator shows connected
The iscsi drive does not show up in disk management anymore
iscsi initiator is a hyper-v guest
Have you rebooted the server that has the USB drive attached since you reconnected it?