First, here's my setup:

OS: RHEL 7.3

ISCSI Target: Server1

ISCSI Initiator: Server2

I'm having the strangest issue with my ISCSI target/initiator configuration and hoping someone can assist me in figuring this out. My target is setup, I have the LUN, ACL, and portal configured successfully and from my initiator I can discover and login to the portal. I cannot however for the life of me figure out why the ISCSI target is not showing up as attached device:

ISCSI Transport Class version 2.0-870
version 6.2.0.873-35
Target: iqn.2016-12.com.mylabserver:target (non-flash)
Current Portal: 172.31.124.133:3260,1
Persistent Portal: 172.31.124.133:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.2016-12.com.mylabserver:client
Iface IPaddress: 172.31.109.185
Iface HWaddress: <empty>
Iface Netdev: <empty>
SID: 1
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED_IN
Internal iscsid Session State: NO CHANGE
*********
Timeouts:
*********
Recovery Timeout: 120
Target Reset Timeout: 30
LUN Reset Timeout: 30
Abort Timeout: 15
*****
CHAP:
*****
username: <empty>
password: ********
username_in: <empty>
password_in: ********
************************
Negotiated iSCSI params:
************************
HeaderDigest: None
DataDigest: None
MaxRecvDataSegmentLength: 262144
MaxXmitDataSegmentLength: 262144
FirstBurstLength: 65536
MaxBurstLength: 262144
ImmediateData: Yes
InitialR2T: Yes
MaxOutstandingR2T: 1
************************
Attached SCSI devices:
************************
Host Number: 2 State: running

Anyone have any ideas??

It looks like it was a bug. I destroyed the VMs then spun them back up with the exact same configuration and the iscsi target mounted as /dev/sda on the initiator.