GNU/Linux Desktop Survival Guide by Graham Williams
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Versions of SSH

A Finnish company developed the original ssh but copyright and patent issues lead to the development of the free OpenSSH.

There are two major (and slightly incompatible) versions of ssh: 1.X and 2.X. From a 2.X client you will not be able to connect to a 1.X server. Connecting to an OpenSSH 2.X server from any version of the client is supported though.