You can use esxcli iscsi session to list sessions.

The following example scenario uses the available commands. Run esxcli iscsi session --help and each command with --help for reference information. The example uses a configuration file to log in to the host. Specify one of the options listed in Connection Options for vCLI Host Management Commands in place of <conn_options>.

Important

The ESXi 4.x ESXCLI commands for managing iSCSI sessions are not supported against ESXi 5.0 hosts.

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List a software iSCSI session at the adapter level. 

esxcli <conn_options> iscsi session list --adapter=<iscsi_adapter>
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List a software iSCSI session at the target level. 

esxcli <conn_options> iscsi session list --name=<target> --adapter=<iscsi_adapter>