A new property that is named Key Exchange Algorithm Selection Policy is added to the SFTP adapter configuration. The value of this property is a comma-separated list of KEX preference order. Token WARN is used to delimit substandard KEXes. For example, ecdh,dh-gex-sha1,dh-group14-sha1,rsa,WARN,dh-group1-sha1. The default value is empty, in which case the WinSCP default KEX selection policy is used. Go to the WinSCP website for more information about KEX.
This property is configurable at individual ports, or at the adapter handler.