Microsoft Security | Microsoft Entra | Microsoft Entra ID
A cloud-based identity and access management service for securing user authentication and resource access
Unable to authenticate to change configuration on Entra Connect Sync
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Gonzalez, Jesus
20
Reputation points
I needed help with an Entra Connect Sync (Azure AD Connect) upgrade and was able to get it working by adding some URLs to the Trusted Sites list in Internet Options:
The sync is working as expected. However, when trying to customize synchronization options within the Entra Connect Sync configuration options, I need to authenticate into AAD to proceed but I receive the same error as before.
I don't have a proxy for my connection and I'm able to get to https://login.microsoftonline.com just fine on Edge. Nothing has changed as far as any security configurations on my server since fixing the authentication issues to upgrade as mentioned in the link above. I did find the following in the trace logs found in the AADConnect folder:
[14:08:04.443] [ 15] [INFO ] MSAL: False MSAL 4.61.3.0 MSAL.Desktop 4.8 or later Windows Server 2019 Standard [2025-12-17 20:08:04Z - b4051b11-eb17-41cd-b081-a55ebdd876cd] Using legacy embedded browser.
Is the Legacy Browser causing the issue? How do I force it to use a more modern way to authenticate?
Microsoft Security | Microsoft Entra | Microsoft Entra ID
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Rahul Jindal 11,511 Reputation points2025-12-18T06:41:50.5533333+00:00 How are you adding the microsoft authentication urls in trusted sites? Have you tried adding using internet options under control panel?
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