Check logs of TLS handshake

Question

With O365, is it possible to check TLS connection logs ?

Answer 1

Hello India Pro,

Thanks for your question.

You can do this using the sign-in logs.

In the Azure portal, search for and select Entra ID.

In the Overview page menu, select Sign-in logs for a user.

Select the Additional details tab or an ellipsis.

See if the "Legacy TLS (TLS 1.0, 1.1, or 3DES)" field is present:

If this field exists and shows a value of "True", then the sign-in attempt used an older version of TLS (likely TLS 1.0 or 1.1).

• If the field is completely absent, the connection likely used TLS 1.2 or a newer, more secure version.

Please let me know if you have further questions**

You can mark it 'Accept Answer' if this helped.