Sync Timeout for replication 'C4 ID' error when synchronizing a replication to a cloud site in VMware Cloud Director Availability 4.x.x
Article ID: 314990
Updated On:
Products
Issue/Introduction
Symptoms:
- Replications to a cloud site are unable to synchronize and in the Replication Tasks view the synchronize task fails with the error:
- In /opt/vmware/h4/cloud/log/cloud.log on the vApp Replication Manager, you see similar entries:
ERROR - [UI__################################################] [c4-scheduler-1] com.vmware.h4.jobengine.JobExecution : Task ###################################### (WorkflowInfo{type='sync', resourceType='vmReplication', resourceId='C4-x###################################'. can't be synchronized'.', isPrivate=false, resourceName='####################'}) has failed
com.vmware.h4.manager.api.exceptions.SyncTimeoutException: Sync timeout for replication ' C4-###############################'. can't be synchronized'.
at com.vmware.h4.cloud.job.VmSyncJob.syncFailed(VmSyncJob.java:110)
at com.vmware.h4.cloud.job.VmSyncJob.lambda$execute$0(VmSyncJob.java:62)
at com.vmware.h4.common.monitoring.ReplicationListener.onComplete(ReplicationListener.java:53)
at com.vmware.task.rest.client.TaskMonitor.lambda$workImpl$0(TaskMonitor.java:189)
at com.vmware.task.rest.client.TaskMonitor.notifyListener(TaskMonitor.java:211)
at com.vmware.task.rest.client.TaskMonitor.workImpl(TaskMonitor.java:188)
at com.vmware.task.rest.client.TaskMonitor.work(TaskMonitor.java:120)
at com.vmware.h4.cloud.service.ManagerTaskMonitorService.lambda$taskMonitor$0(ManagerTaskMonitorService.java:102)
at com.vmware.h4.common.mdc.MDCRunnableWrapper.run(MDCRunnableWrapper.java:30)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.
Environment
VMware Cloud Director Availability 4.x.x
Cause
This issue occurs when the source VMware Cloud Director Availability On-Premises appliance or Cloud Director Availability Tunnel appliance, depending on the type of source site, is unable to communicate with the Cloud Director Availability Tunnel appliance in the destination cloud site.
Resolution
To resolve this issue:
- Ensure that the source Cloud Director Availability appliance is able to communicate with the public API endpoint in the destination cloud site directly over port 8048/TCP or 443/TCP if DNAT is configured for the public endpoint.
- If using Azure repair local replicator using the following run command - Repair-LocalReplicator - More details here VMware Cloud Director Availability Run command glossary
- Ensure that we check and allow all the necessary ports required for communication for the VCDA appliance as per the Network requirements and prerequisites.
Use the curl command to verify the connectivity between the appliances.
Example: For the network Communication to complete we need the ESXi host and the VMware Cloud Director Availability On-Premises Appliance to communicate over the port
44046/TCP.Port44046/TCPis used for transferring replication data traffic from the ESXi hosts to the VMware Cloud Director Availability On-Premises Appliance. We can use the curl command from the esxi host to on prem:curl -kv https://ON-PREM_FQDN_or IP:44046
Additional Information
For more information on port requirements in cloud deployments, please refer to the "Network requirements and prerequisites in the Cloud Director site" section and ensure that the necessary ports are enabled in VMware Cloud Director Availability.
For detailed information on VMware ports and protocols for VMware Cloud Director Availability and on-premises appliances in cloud environments, please consult the following document: VMware Ports and Protocols for vCDA Cloud.
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