Configure AAD Sync task: an error occurred while sending the request

Question

Need Assistance with troubleshooting a Microsoft Azure Active Directory Connect installation error. I am Receiving the following error message when Installing AAD Connect Agent on one (1) of my On-Premise AD Domain Controllers: "Configure AAD Sync task: an error occurred while sending the request."

I have attempted to Uninstall and Reinstall twice, but am still receiving the same error. I can't tell if this is a 'Connectivity' related issue (Network), or if there is something else causing the initial 'Sync-Task' to fail. ANY Help would be Greatly Appreciated!

Answer 1

Thanks for your question.

This is likely as a result of TLS 1.2 not being selected and used by Connect. Run the script below to enforce this:

https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/reference-connect-tls-enforcement#powershell-script-to-enable-tls-12

The above should fix the issue.

A lesser possibility is if you have a proxy. In that case see: https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/tshoot-connect-connectivity#connectivity-issues-in-the-installation-wizard

You can mark it 'Accept Answer' and 'Upvote' if this helped you

Regards,

Abiola