Issue with Entra Connect Tool installation on Windows Server 2016

Question

I am trying to install the Entra Connect tool on a Windows Server 2016. However, I am getting an error message that says:

"Unable to validate credentials due to an unexpected error. Restart Azure AD Connect with the /InteractiveAuth option to further diagnoses this issue. (externedMessage: An error occurred while sending the request. | The underlying connection was closed: An unexpected error occurred on a send. | unable to read data from the transport connection: An existing connection was forceibly colsed by the remote host. "

I have tried running the Entra connect with the /InteractiveAuth parameter using the command prompt, but I still get the same error message.

Here is some information about my infrastructure:

• The domain controller and the sync server are deployed on Hyper-V VM.
• Both are connected using a private switch.
• There is another default switch attached to provide internet access.

I have included a screenshot of the error message.

Can anyone help me understand why I am encountering this issue and how to resolve it? Thank you.

Answer 1

Hi @Subhash Kumar Mahato

I am sorry for the inconvenience you have faced while you are configuring the Entra connect.

It might be issue with the TLS 1.2 is not enabled in the .NET framework

Could you please run the below PowerShell script to enforce TLS 1.2.

PowerShell script to enable TLS 1.2
Before installing, please read and verify the Prerequisites for Microsoft Entra Connect.

If your Hybrid Identity Administrators have MFA enabled, the URL https://secure.aadcdn.microsoftonline-p.com must be in the trusted sites list. You're prompted to add this site to the trusted sites list when you're prompted for an MFA challenge, and it hasn't been added before. You can use Internet Explorer to add it to your trusted sites.

If the issue persists, please refer the below article

Azure AD Connect – Unable to validate credentials due to an unexpected error.

Hope this helps. Do let us know if you any further queries.

Thanks,

Akhilesh.

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