Log ciphers actually in use by customers

Hi

I need to log what ciphers are in use by our customers using FTPS. I need to find those customers that are using old ciphers or SSL protocols, so I can contact them before I disable at my side.

Is there a way to tell ServU MFT server to log information about the negotiated SSL/TLS cipher and protocol level when a user logs in? Or does anyone know of another way to get this info without tracing each customer?

Thanks