SSL3 alert write: fatal: handshake failure with WinSCP 6.5.1

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FeelAirSlow
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SSL3 alert write: fatal: handshake failure with WinSCP 6.5.1

Hello,
I have the following error with WinSCP 6.5.1 when connecting to a public Explicit FTPS server (for connexion params : cf. https://dlptest.com/ftp-test/) :
SSL3 alert write: fatal: handshake failure
OpenSSL 0A00018A: dh key too small
Can't establish TLS connection.
Disconnected from server
Connection failed.
Interestingly, I finally managed to make it work with WinSCP GUI by setting minimum TLS version 1.1.
But I think there is a problem in WinSCP, because the server doesn't support TLSv1.1 (indeed, Wireshark says TLSv1.2 is used).

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