The following is from the
OpenSSH website. If you do some Google searching, you will find more information concerning this.
Quote:
2.14 - Why does OpenSSH report its version to clients?
OpenSSH, like most SSH implementations, reports its name and version to clients when they connect, e.g.
SSH-2.0-OpenSSH_3.9
This information is used by clients and servers to enable protocol compatibility tweaks to work around changed, buggy or missing features in the implementation they are talking to. This protocol feature checking is still required at present because the SSH protocol has not been yet published as a RFC and more incompatible changes may be made before this happens.
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