[Satellite 6] - Error while creating new host "Unable to fetch TFTP boot file ([RestClient::BadRequest]: 400 Bad Request) for Capsule https://satellite.example.com:9090/tftp"]}"

Issue

• Provisioning a new host from Red Hat Satellite 6 fails with error "ERF12-2573 [ProxyAPI::ProxyException]: Unable to fetch TFTP boot file ([RestClient::BadRequest]: 400 Bad Request) for Capsule https://satellite.example.com:9090/tftp"]}}".