Error log:
Dec 22 11:07:39 Prod-TrueNAS kernel: [0]: iscsi-scst: ***ERROR***: Connection 000000006613521e with initiator iqn.1998-01.com.vmware:esxi-storage:422237150:64 unexpectedly closed!
Dec 22 11:07:50 Prod-TrueNAS kernel: [0]: iscsi-scst: ***ERROR***: Connection 00000000d517d14f with initiator iqn.1998-01.com.vmware:esxi-storage:422237150:64 unexpectedly closed!
Dec 22 11:08:02 Prod-TrueNAS kernel: [0]: iscsi-scst: ***ERROR***: Connection 000000006613521e with initiator iqn.1998-01.com.vmware:esxi-storage:422237150:64 unexpectedly closed!

Messages log:

Dec 22 11:08:02 Prod-TrueNAS kernel: [136532]: iscsi-scst: Freeing conn 000000006613521e (sess=00000000ca637ac0, 0x90100003d0200 0, initiator iqn.1998-01.com.vmware:esxi-storage:422237150:64#<IP>)
Dec 22 11:08:02 Prod-TrueNAS kernel: [136532]: iscsi-scst: Freeing session 00000000ca637ac0 (SID 90100003d0200)
Dec 22 11:08:02 Prod-TrueNAS kernel: [125242]: scst: Using security group "security_group" for initiator "iqn.1998-01.com.vmware:esxi-storage:422237150:64#<IP>" (target iqn.2005-10.org.freenas.ctl:nvme)
Dec 22 11:08:02 Prod-TrueNAS kernel: [125242]: iscsi-scst: Session 000000002afd1c15 created: target 00000000ddd7a749, tid 3, sid 0xa0100003d0200, initiator iqn.1998-01.com.vmware:esxi-storage:422237150:64#<IP>
Dec 22 11:08:02 Prod-TrueNAS kernel: [125242]: iscsi-scst: Negotiated parameters: InitialR2T No, ImmediateData Yes, MaxConnections 1, MaxRecvDataSegmentLength 1048576, MaxXmitDataSegmentLength 131072, 
Dec 22 11:08:02 Prod-TrueNAS kernel: [125242]: iscsi-scst:     MaxBurstLength 262144, FirstBurstLength 65536, DefaultTime2Wait 0, DefaultTime2Retain 0, 
Dec 22 11:08:02 Prod-TrueNAS kernel: [125242]: iscsi-scst:     MaxOutstandingR2T 1, DataPDUInOrder Yes, DataSequenceInOrder Yes, ErrorRecoveryLevel 0, 
Dec 22 11:08:02 Prod-TrueNAS kernel: [125242]: iscsi-scst:     HeaderDigest None, DataDigest None, OFMarker No, IFMarker No, OFMarkInt 2048, IFMarkInt 2048, RDMAExtensions No
Dec 22 11:08:02 Prod-TrueNAS kernel: [125242]: iscsi-scst: Target parameters set for session a0100003d0200: QueuedCommands 32, Response timeout 90, Nop-In interval 30, Nop-In timeout 30
Dec 22 11:08:02 Prod-TrueNAS kernel: [125242]: iscsi-scst: Creating connection 00000000e93e9269 for sid 0xa0100003d0200, cid 0 (initiator iqn.1998-01.com.vmware:esxi-storage:422237150:64#<IP>)