If you get the following error reported on the Dell EqualLogic SAN (I had it on a PS4100 with 2 x ESXi hosts and a Cisco 3750G switch):

iSCSI login to target ‘, iqn.2001-05.com.equallogic:0-1cb196-9480c9216-6930000000b51129-vmware-datastore1’ from initiator ‘, iqn.1998-01.com.vmware:celonesx1-021769e6’ failed for the following reason: | Initiator disconnected from target during login.

The fix is to change the Login Timeout value from 5 to 60 seconds and disable ACK Offload on the iSCSI software initiator on each ESXi host and reboot the hosts – this solved the issue for me.

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