How to fix Azure AD Connect Sync Service is not running

Question

Hi All,

About a week ago we started receiving email alerts that our AadSyncService has stopped running. This usually resolves itself within 10 minutes. We also see another email alert that Password Hash Synchronization heartbeat was skipped in last 120 minutes. This also seems to resolve itself.

We do not see any error messages in the azure cloud and it seems like this is not causing any issues with password replication. However, we do not want to problem to get worse. And I hate to see these messages.

The Active directory server is Windows server 2016 in a VMware environment. I've increased the memory and CPUs for this OS which seemed to decrease the prevelance of the email alert, but this may be a coincidence.

If anyone has any suggestions it would be really appreciated.

Answer 1

@Childs, Jason Thank you for reaching out to us, would like to understand how many times did this issue happen in your environment before and after the hardware changes (post increase in memory & cpu's) on the server ?

Do you see any events in the system/application logs in the event viewer at the time of issue ?

Also, would recommend to check the hardware pre-reqs as defined here - https://learn.microsoft.com/en-us/azure/active-directory/hybrid/connect/how-to-connect-install-prerequisites#:~:text=Hardware%20requirements%20for%20Azure%20AD%20Connect

What is the version of Azure AD Connect installed on the server ? if it is old version, try to upgrade to the latest version and verify the issue.

Similar issue has been worked by one of my colleague last year - https://learn.microsoft.com/en-us/answers/questions/946068/azure-ad-connect-sync-service-is-not-running try to check the steps/approach mentioned in this post and see if it helps to isolate this issue.

Let me know if you have any further questions, feel free to post back, if required we can connect offline to troubleshoot the same.

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