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Description of problem: * Hosted-Engine * RHV 3.6 using legacy domain management tool * Upgrade from 3.6 to 4.0 During the upgrade from 3.6 to 4.0, the appliance upgrade will fail if the 3.6 Manager was using the legacy directory server domain management tool. 4.0 does not support this legacy tool. Before the upgrade, while still in 3.6, the user must migrate to the new aaa tool as already documented: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Virtualization/3.6/html/Administration_Guide/Migrating_from_the_legacy_provider_to_aaa.html
See BZ #1368604
Please add this to the Upgrade Helper: https://access.redhat.com/labs/rhevupgradehelper/