I recently encountered problems after upgrading Azure AD Connect to version 2.6.1.0. Microsoft Sync stopped working, and it turned out the upgrade auto-installed itself. I found out that the upgrade has issues within its assembly. Thankfully, I discovered a source for the old MSI versions since Microsoft seems to have removed options for rolling back problematic updates. Has anyone else experienced similar issues? I'm getting an error when trying to run the sync: `System.InvalidOperationException: There was an issue obtaining cloud sync intervals...` The log is too lengthy to detail everything here, but I could use some tips on how to manage this situation.
5 Answers
This post might be helpful for you: check out [this guide on fixing Entra connect update issues](https://martin.rublik.eu/2026/02/02/failed-ad-connect-update.html). It details how a modified miiserver.config could cause the upgrade to fail, which could align with what you're dealing with.
I manage multiple AD connect servers, and most are running that latest update without issues. If you need to rebuild one, just grab the recent JSON from C:program data. I've had to do that a few times, and the rebuild process is pretty straightforward.
I can't check right now, but I remember a recent Entra Connect update changed some things with authentication permissions. It might be worth reviewing the version history to see if any changes apply to your setup.
I had a similar experience late last night and ended up having to back up everything and reinstall the required MSI, which I found here: [old Azure AD Connect versions](https://itpro-tips.com/download-old-azure-ad-connect-versions/). Remember to reboot after removing it and avoid ticking options to remove SQL when you uninstall. It worked for me! I'll check back in tomorrow if anyone needs further help.
I got an alert too about sync stopping and saw sync dates were in the future. I opened a ticket with Microsoft. By the time they called back, the sync had resumed. Just a heads-up, they mentioned the new versions may not support auto-upgrade anymore, which is a bummer.
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