tmnxSSHServerVersion specifies the SSH protocol version that will be
by supported by the SSH server.
A value of tmnxSSHServerVersion 'version1' specifies that the SSH
server will only accept connections from clients that support SSH
protocol version 1. A value of 'both' specifies that the SSH server
will accept connections from clients supporting either SSH protocol
version 1, or SSH protocol version 2 or both.