For file transfer scripts or other non-interactive users, the public host key needs to be replaced on the client-side for clients that do not support hostkey rotation, for example file transfer jobs originating from Tectia SSH Server on IBM z/OS.

After the host key change client-side tools that obtain the current host key from the server like Tectia ssh-broker-ctl probe-key or ssh-keyfetch can be used. The following command can be used to view keys in local host key store(s) for the server:

ssh-keygen-g3 -F host_id

where host_id is hostname or address#port, e.g. serverhost