This message indicates that you are connecting to a remote host computer that is using version 1 of the SSH protocol (SSH1).
Please note that SSH version 2 (SSH2) is a more advanced protocol than the legacy version SSH1. For more information on using an SSH1 connection, see the F-Secure SSH support web site at
http://www.f-secure.com/support/ssh/.
If you choose to accept the SSH1 connection, multiple terminal windows and the file transfer operations are not available.
If you do not want to see this message again, select the appropriate SSH1 Connections setting from the Security page of the Settings dialog.