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Usually - the error No valid host was found comes from nova-scheduler if after applying all scheduler filters there is no hypervisor capable of satisfying the request and this is before any networking is configured for the instance - so not sure if the above two are for the same instance? can you double check?

what is the flavor of instance you are trying to launch - vcpus, memory and disk? and what does your hepervisor report as available capacity when you login as admin?

Also - just have a look at following link, which although is very very old see if that helps - https://bugzilla.redhat.com/show_bug.cgi?id=881741