Hello,
if you want to configure iSCSI in vmware ESX/ESXi, check this vmware's kb:
VMware KB: Configuring and troubleshooting basic software iSCSI setup
In order to do iSCSI troubleshhoting, this vmware's kb can be checked:
VMware KB: Troubleshooting ESXi/ESX connectivity to iSCSI arrays using software initiators
Best regards,
Pablo