To enable Elliptic Curve Diffie–Hellman (ECDH) key exchange algorithms for Tectia Client, add the ECDH KEX names within the <kexs> element in your ssh-broker-config.xml:

<kexs>
  <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" />
</kexs>