Data synchronization between sites vmwNsxTDataCenterSiteName(vmwNsxTDataCenterSiteId) and vmwNsxTDataCenterRemoteSiteName(vmwNsxTDataCenterRemoteSiteId) failed for the vmwNsxTDataCenterFlowIdentifier. Reason: vmwNsxTDataCenterSyncIssueReason Action required: 1. Check the network connectivity between remote site and local site via ping. 2. Ensure port TCP/1236 traffic is allowed between the local and remote sites. 3. Ensure the async-replicator service is running on both local and remote sites. Invoke the GET /api/v1/node/services/async_replicator/status NSX API or the `get service async_replicator` NSX CLI command to determine if the service is running. If not running, invoke the POST /api/v1/node/services/async_replicator?action=restart NSX API or the `restart service async_replicator` NSX CLI to restart the service. 4. Check /var/log/async-replicator/ar.log to see if there are errors reported.