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To enable Elliptic Curve Diffie–Hellman (ECDH) key exchange algorithms for Tectia Client, do the following:
In the Tectia Connections Configuration GUI, go to General > Default Connection > KEXs. Clear the Use factory defaults check box.
ECDH-NISTP521 to the Enabled KEXs list.
Once you have enabled the ECDH KEXs, you can change the order of the list using the red up and down arrow buttons. Tectia Client reads the list in the top-down order.