[Users] Migration failing

Hi guys, I've just migrated all(3) my VM's from one host to another for planned maintenance, and now when trying to migrate the VM's back to the original host, I'm receiving a "Fatal error" and can't migrate a single machine back to node02. Attached is my engine.log I'm running Centos 6.3 with the following oVirt package versions from dreyou. ovirt-engine-setup-3.1.0-3.19.el6.noarch ovirt-engine-3.1.0-3.19.el6.noarch ovirt-engine-sdk-3.1.0.5-1.el6.noarch ovirt-engine-jbossas711-1-0.x86_64 ovirt-engine-config-3.1.0-3.19.el6.noarch ovirt-image-uploader-3.1.0-16.el6.noarch ovirt-engine-webadmin-portal-3.1.0-3.19.el6.noarch ovirt-engine-notification-service-3.1.0-3.19.el6.noarch ovirt-log-collector-3.1.0-16.el6.noarch ovirt-engine-genericapi-3.1.0-3.19.el6.noarch ovirt-engine-userportal-3.1.0-3.19.el6.noarch ovirt-engine-tools-common-3.1.0-3.19.el6.noarch ovirt-engine-backend-3.1.0-3.19.el6.noarch ovirt-iso-uploader-3.1.0-16.el6.noarch ovirt-engine-cli-3.1.0.7-1.el6.noarch ovirt-engine-restapi-3.1.0-3.19.el6.noarch ovirt-engine-dbscripts-3.1.0-3.19.el6.noarch Any ideas? I need to shut down both hosts tomorrow for RAM upgrades, but my plan was to avoid downtime by migrating all the VM's to one machine and then the other. Any assistance is greatly appreciated. This system was upgraded from oVirt 3.0 to 3.1 and the engine was moved to another physical machine and the hostname was changed as well. Thanks. Regards, Neil Wilson.