IPv6 Deployment Status: latest error msg for ub.bw

Error(s) found during latest scan: NS=ns2.ub.bw=2001:43f8:2a0::231 does not respond, NS=ns1.ub.bw=2001:43f8:2a0::230 does not respond, NS=ns3.ub.bw=2001:43f8:2a0:4