During system shutdown or reboot I see iscsi "detected conn error" messages and the shutdown hangs or delays in RHEL 5 or 6

Issue

• When I reboot a RHEL 6 server it appears to hang forever after:

Stopping cgconfig service                           [OK]

• When I shutdown a system using LVM on top of iSCSI I get connection errors and the shutdown hangs:

Mar 30 09:29:04 hostname1 kernel: connection9:0: detected conn error (1020)
Mar 30 09:29:04 hostname1 kernel: connection3:0: detected conn error (1020)
Mar 30 09:29:04 hostname1 kernel: connection12:0: detected conn error (1020)