The host public-key pair (1536-bit RSA) is generated during the setup of Tectia Server. 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 the Server.