When trying to migrate a VM I get the following error in the log:
1. Starting migration of VM rhvm1 from Host toronto.demo.redhat.com to Host atlantic.demo.redhat.com (User: admin@internal.).
2. Migration failed due to Error: Migration destination has an invalid hostname (VM: rhvm1, Source Host: toronto.demo.redhat.com).
It was a local dns error, atlantic.demo.redhat.com had a typo in my dns records. All is well now.