At this point if you have already confirmed the network configuration is well. I would start looking at the physical layer. Have you tried swapping the patch cables for vmnic3, connected something else to it's switch port to confirm that the switch port is working correctly? If it is not the cable or the switch port I would then try configuring your iscsi vmkernel interface on another vswitch using a vmnic other than the current one to confirm that it is not the network card that is the issue.
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