ADSync service not starting

Question

Hi

I am sitting with a customer where the AD Sync service fails to start. It gives a "Login failed for user" error in the event viewer.

It was working perfectly untill a couple of nights ago. When you try and run AAD Connect, it just fails saying that the service is not started.

Any assistance will be appreciated.

Answer 1

Good Morning

I hope you all are doing well.

Just want to follow up if anyone maybe has an answer for me on this issue. What would the next steps be to try and get this sorted?

Any feedback will be highly appreciated.

Answer 2

Good Morning

I had a look in the event viewer again.

The only errors I can see is:

1. Failed to open database

Event ID : 6215

Login failed for user

Failure Code : 0x80004005

Minor Number : 18456

1. ADSync service failed to successfully start and is attempting to retry

Event ID : 2005

Login failed for user

Failure Code : 0x80004005

Minor Number : 18456

Cannot open database ADSync The login failed

Minor number : 4060

Any help will be appreciated.

Answer 3

Hi @Eben van Rooyen ,

To add to Andy David's answer, I would recommend checking the Event Viewer to see if there are any additional errors or Event IDs listed. It sounds like you might be receiving the error "Error 1069: The service did not start due to a logon failure."

If you check the Event Viewer, you may see more detailed information. For example, if you see "Event ID 7041: This service account does not have the required user right 'Log on as a service'", it's possible that you are using a virtual service account which doesn't exist at the domain, but you are modifying the user right settings through a GPO. If this is the case, you may need to add some exclusions to your group policy or clear the password fields from the service account. See also: https://learn.microsoft.com/en-us/troubleshoot/azure/active-directory/services-sync-not-start

Let me know if this helps and if you have further questions.

If the information helped you, please Accept the answer. This will help us as well as others in the community who may be researching similar information.

Answer 4

Did someone reset the password?

https://social.technet.microsoft.com/wiki/contents/articles/32912.powershell-get-aduser-to-see-password-last-set-and-expiry-information-and-more.aspx