To enable the Elliptic Curve Diffie–Hellman (ECDH) key exchange algorithms for Tectia Server, add the ECDH KEXs under the existing KEXs in your ssh-server-config.xml:

<kex name="diffie-hellman-group14-sha1" />
<kex name="diffie-hellman-group14-sha256@ssh.com" />
<kex name="diffie-hellman-group-exchange-sha1" />
<kex name="diffie-hellman-group-exchange-sha256" />
<kex name="ecdh-sha2-nistp256" />
<kex name="ecdh-sha2-nistp384" />
<kex name="ecdh-sha2-nistp521" />