Particular systems fail to login an iSCSI target which has multiple controllers even other systems can login.

Issue

• Particular systems fail to discover or login to iSCSI target which has multiple controllers, even other systems can login. The iSCSI initiator and target are not in the same subnet.

  $ iscsiadm -m discovery -t sendtargets -p 192.0.2.11 -d8
  iscsiadm: Max file limits 1024 4096
  iscsiadm: updating defaults from '/etc/iscsi/iscsid.conf'
  [...]
  iscsiadm: read 48 PDU header bytes, opcode 0x24, dlength 0, data 0xxxxxxxxxxxxx, max 32768
  iscsiadm: discovery session to 192.0.2.11:3260 received text response, 0 data bytes, ttt 0xffffffff, final 0x80
  iscsiadm: discovery process to 192.0.2.11:3260 exiting
  iscsiadm: disconnecting conn 0xxxxxxxxxxxxx, fd 3
  iscsiadm: No portals found