Maybe this help to investigate the problem...
When at MBEx I turn OFF-Disable SOL&IDER, reboot, enter MBEx and make them ON-Enable, reboot, connect via Manageability Commander - at RemoteControl tab the third option "Redirection port" is OFF-Disabled! And after I press near button "Redirection port" becomes Enabled... but maybe its not... ???
Also I don't see this option "Redirection port" at MEBx.
Is there any other software except ManageabilityCommander&MechCommander that can use AMT 5.0 IDE-R function and boot from IDE-R disks images ???