AIQUM でクラスタを追加できません。WebSocket ハンドシェイク中にエラーが発生しました。DNS NXDOMAIN

Active IQ Unified Manager（AIQUM）9.14+

• Active IQ Unified Manager にクラスタを追加できません。GUI エラー：

Unable to add cluster datasource. This can occur if the clocks on the systems are not synchronized and the Active IQ Unified Manager HTTPS certificate start date is later than the date on the cluster, or if the cluster has reached the maximum number of EMS notification destinations.

• Server_acq.log：

2025-02-05 16:29:19,271 ERROR [default task-17168] c.n.u.CloudAgentConnectionUtil (CloudAgentConnectionUtil.java:223) - Failed to establish connection for cloud agent instance "UnifiedManager_XXXXXX-XXXX-XXXX-XXXXX-XXXXXX". Reason: AMQP transport failed for connection "UnifiedManager_XXXXXX-XXXX-XXXX-XXXXX-XXXXXX". Reason: Error during websocket handshake: DNS NXDOMAIN.

2026-08-05 12:24:26,806 ERROR [default task-299] c.n.s.a.s.r.s.i.AcquisitionFacadeSessionServiceImpl (AcquisitionFacadeSessionServiceImpl.java:905) - Fail to add data source for acquisitionUnitName: local, dataSourceName: ClusterIP, vendor:NetApp OCI Essentials, model: NetApp OCI Essentials, datasourceTypeId: 91, manual: 1, isActive: false, attrs: -- listing properties --
netappfoundation.numBuilderThreads=3
um.ems.rest.destination=UM_FQDN
com.netapp.oci.netapp.client.interfaces.data.EmsManagerException: Connection timed out: connect (errno=0) (errno=0)

2026-07-31 13:24:55,295 ERROR [default task-119961] c.n.s.a.s.r.s.i.AcquisitionFacadeSessionServiceImpl (AcquisitionFacadeSessionServiceImpl.java:916) - Failed to unregister ems event filter destination for UM_FQDN after failure to add datasource

• ocum-error.log

Common name in the host certificate is invalid 

• CLI を介してクラスターを追加すると失敗する  ERROR: connect timed out