iSCSI login failed with error 24 - Could not log in to all portals
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On the client machine you have to edit the initiatorname in the file initiatorname.iscsi. The name is the iqn which is created as ACL.

$ vi /etc/iscsi/initiatorname.iscsi
InitiatorName=iqn.2015-06.world.server:www.server.world