I recently ran into an issue where we were facing authentication issues with Azure Pass-through Authentication. After ensuring that Pass-Through Authentication was still enabled in the Azure Portal and the hosting server was in an Active state, I went to the logs. In the logs, I found the following error.
Error
“AADSTS80001: No Microsoft Azure AD Connect Authentication Agent was found. Make sure that your environment is configured correctly. If your directory is set for pass-through authentication, make sure that your Microsoft Azure AD Connect Authentication Agent is online.”
Resolution
The error message was helpful and led me to our Azure Active Directory services. I noticed that the Microsoft AAD Application Proxy Connector was stopped. So even though Azure shows the service and server as healthy, it was finished. A quick start to this service got us back up and running again.
NOTE: I think it’s also worth mentioning that for this error Microsoft states the following, “Ensure that agent servers are members of the same AD forest as the users whose passwords need to be validated and they are able to connect to Active Directory.”
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