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Hi,

It sounds like you might need to perform some additional steps to configure your cloud for live migrations. Particularly, you need to set up SSH so your hypervisor hosts can log into each other (if you google "Host Key Verification Failed" you will find some techniques to deal with this, such as distributing a known_hosts file).

Further information about migrations can be found in the Admin Guide at http://docs.openstack.org/admin-guide-cloud/compute-configuring-migrations.html