The host public-key pair (1536-bit RSA) is generated during the setup of Tectia Server (Running the Setup Script). You only need to regenerate it if you want to change your host key pair.
Tectia Server for IBM z/OS includes a program that generates a key pair, ssh-keygen-g3, which is located in
Generate the key pair for the server in such a way that the private key has no passphrase (option
-P). The server will then start up without any operator interaction to enter a passphrase. Protect the key with file system access rules. The private key (
/opt/tectia/etc/hostkey) must be accessible only by the
To (re)generate the host key, perform the following tasks:
suto switch to a UID 0 user (if you are not already logged in as one).
Run ssh-keygen-g3 to generate the host key, for example:
# /opt/tectia/bin/ssh-keygen-g3 -t rsa -P /opt/tectia/etc/hostkey
This will generate a 2048-bit RSA key pair without a passphrase and store it under
For more information on the key generation options, see the Tectia Server for IBM z/OS User Manual or the ssh-keygen-g3 man page.
Restart the server as instructed in Restarting and Stopping sshd2.