Windows Azure AD Sync/ADFS not syncing

I am running an ADFS server on-premise to give SSO to our O365 accounts.  However, it seems to not be syncing any longer.  In the event viewer and in services, I noticed that the Forefront Identity Manager Sync Service was failing with an error 1006 "The volume for a file has been externally altered so that the opened file is no longer valid." and that my miiserver..exe.config file reads 0 KB.

Any thoughts on how I can rectify this?  I have a new employee starting immediately that needs our O365 apps.

Thanks.

Grog
fcumminsAsked:
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Vasil Michev (MVP)Commented:
Probably the fastest way to fix that is to restore the .config file from a backup. Other than that, just uninstall/reinstall the AAD Sync client, it takes few mins max (you should also consider switching to the new AAD Connect tool, as AAD Sync is getting deprecated).
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fcumminsAuthor Commented:
Thanks, Vasil.  I went ahead and installed the new AAD connect tool - everything is copacetic now.

Grog
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fcumminsAuthor Commented:
Uninstall DirSync and installing the new AAD Connect tool resolve the issue.  Thanks.
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