What Is SSH1 Compatibility?
The SSH1 and SSH2 protocols are not compatible. This means that SSH1 clients cannot connect to a SSH2 daemon. However, the SSH2 daemon can be configured to start up a SSH1 daemon when it receives a connection from a SSH1 client. This allows both SSH1 and SSH2 clients to connect to such a Secure Shell daemon. The process of handing off to a SSH1 daemon is transparent to the end user.