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Why does OpenSSH report its version to clients?

April 26, 2017clients OpenSSH report version

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Why does OpenSSH report its version to clients?

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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 versions with incompatibilities are still in wide use.