To enable ECDSA host-key algorithms for Tectia Client, do the following:
In the Tectia Connections Configuration GUI, go to General > Default Connection > Server and clear the Use factory defaults check box.
ecdsa-sha2-nistp521to the Enabled Hostkey Algorithms list.
Once you have enabled the ECDSA host-key algorithms, 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.
To enable ECDSA host keys for X.509, repeat the process described above but select the algorithms named