I'm puzzled by the sudden appearance of this error message, and, if I ignore it, don't check the 'check box', and proceed, looks like I have a completely secure connection (Protocol TLS1.2, Cippher AES-256-GCM, Key Exchange ECDHE....)."This server does not support TLS session resumption on the data connection.
<bunch of stuff about why this is important>
Then a checkbox asking if I want to allow insecure data connection for this server in future sessions.
Many thanks in advance...