How to manually open hast partition via iscsi?

Question

iSCSI

I'm using freenas 9.3. I create zvol-volumes on 2 servers. I unite in hast. Replication is working fine. There is a need to open a couple of hast volumes using iscsi. When I try to do this using the admin panel, I get an error related to the work of django. I created a ticket to the developers, but they are still silent. How to configure hast by iscsi manually?