Azure AD Connect Delta Sync Problem

Question

Hello,

I have a problem on the Azure AD Delta Sync.

When I keep calling the cmdlet "Start-ADSyncSyncCycle -PolicyType Delta" in a short time, 2 kinds of error will be return:

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Start-ADSyncSyncCycle : System.InvalidOperationException: A sync cycle has already being requested. Cannot start a new run till this one completes.

   at Microsoft.MetadirectoryServices.Scheduler.Scheduler.StartSyncCycle(String overridePolicy, Boolean interactiveMode)

   at SchedulerUtils.StartSyncCycle(SchedulerUtils* , Char* policyType, Int32 interactiveMode, Char** errorString)

At line:1 char:1

• Start-ADSyncSyncCycle -PolicyType Delta

    + CategoryInfo          : WriteError: (Microsoft.Ident...ADSyncSyncCycle:StartADSyncSyncCycle) [Start-ADSyncSyncCycle], InvalidOperationException

    + FullyQualifiedErrorId : System.InvalidOperationException: A sync cycle has already being requested. Cannot start a new run till this one completes.

   at Microsoft.MetadirectoryServices.Scheduler.Scheduler.StartSyncCycle(String overridePolicy, Boolean interactiveMode)

   at SchedulerUtils.StartSyncCycle(SchedulerUtils* , Char* policyType, Int32 interactiveMode, Char** errorString),Microsoft.IdentityManagement.PowerShell.Cmdlet.StartADSyncSyncCycle

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Start-ADSyncSyncCycle : System.InvalidOperationException: Connector: [Connector] - AAD is busy.

   at Microsoft.MetadirectoryServices.Scheduler.Scheduler.StartSyncCycle(String overridePolicy, Boolean interactiveMode)

   at SchedulerUtils.StartSyncCycle(SchedulerUtils* , Char* policyType, Int32 interactiveMode, Char** errorString)

At line:1 char:1

• Start-ADSyncSyncCycle -PolicyType Delta

    + CategoryInfo          : WriteError: (Microsoft.Ident...ADSyncSyncCycle:StartADSyncSyncCycle) [Start-ADSyncSyncCycle], InvalidOperationException

    + FullyQualifiedErrorId : System.InvalidOperationException: Connector: [Connector] - AAD is busy.

   at Microsoft.MetadirectoryServices.Scheduler.Scheduler.StartSyncCycle(String overridePolicy, Boolean interactiveMode)

   at SchedulerUtils.StartSyncCycle(SchedulerUtils* , Char* policyType, Int32 interactiveMode, Char** errorString),Microsoft.IdentityManagement.PowerShell.Cmdlet.StartADSyncSyncCycle

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How can I solve this problem? Thank you.

Answer 1

Hi Chiu Leung Lau,

From the error message, a sync cycle is already requested, and it is in pending state. Azure AD is too busy to process the request.

I suggest you wait enough time, such as 30 minutes, 1 or 2 hours. So that the existing sync can be fully completed.

If the issuer persists, I will collect related information for further troubleshooting.

Thanks,

Young

Answer 2

Hi Chiu Leung Lau,

Do you have any update?

Thanks,

Young

Answer 3

Hi Young,

I just avoid to keep calling the cmdlet so the errors don't occur again so far.

Thanks for the help.

Best regards,

Chiu