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When opening the transparent tunnel or an SFTP session with FTP-SFTP conversion, accepting new or changed server host keys cannot be prompted from the user. In addition, transparent FTP tunneling and FTP-SFTP conversion always use the IP address of the Secure Shell server when opening the secure tunnel. This means that the host keys of the Secure Shell tunneling servers must be stored beforehand based on the IP addresses of the servers.
The keys can be stored by connecting to each host individually with the IP address of the host using an interactive shell and accepting the host keys one by one, or by using the ssh-keydist-g3 key distribution tool. More information and examples on storing remote server keys can be found in SSH Tectia Server for IBM z/OS User Manual.
Disabling Host-Key Check
As an alternative to storing the remote server host keys, it is possible to disable the host-key checking entirely. To do this, set the accept-unknown-host-keys element to yes in the ssh-socks-proxy-config.xml file. The element must be placed before the profiles element as shown below.