Resolved - Failed to configure MIIS post database

After installing SharePoint 2013 SP1 CU 201609 on DEV server, "User Profile Synchronization Service" stopped working. ULS log shows the error message below.

UserProfileApplication.SynchronizeMIIS: Failed to configure MIIS post database, will attempt during next rerun. Exception: System.Configuration.ConfigurationErrorsException: ERR_START_SERVICE    
 at Microsoft.Office.Server.UserProfiles.Synchronization.ILMPostSetupConfiguration.ValidateConfigurationResult(UInt32 result)    
 at Microsoft.Office.Server.Administration.UserProfileApplication.SetupSynchronizationService(ProfileSynchronizationServiceInstance profileSyncInstance).

I tried all possible solutions through online research, but, none of them works.

In the end, I submitted a Microsoft support ticket.  It turns out that we have to remove "Forefront Identity Manager Service" from the dependency of windows service "FIMSynchronizationService"

Create a ".reg" file, then add the text below to it, then merge this reg file into the Windows of SharePoint server.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\FIMSynchronizationService]
"DependOnService"=hex(7):57,00,69,00,6e,00,6d,00,67,00,6d,00,74,00,00,00,00,00

Then reboot the server. Below is the result.

Now we can start the SharePoint service instance "User Profile Synchronization Service".

I hope this post can save you some headache.


PS: Microsoft support team said they never got this issue before. So I assume it only happens when SharePoint and Database are installed on the same server.