GH-709: Handle keep-alive channel messages sent by an old OpenSSH server#710
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…SH server OpenSSH < 5.1p1 (from 2008!) does not handle a success reply and then disconnects after a few keepalives. It really needs a failure reply. Since 5.1p1, OpenSSH can handle both failure and success replies to its keepalive channel messages. Always return a failure reply if the request is "keepalive@openssh.com".
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OpenSSH < 5.1p1 (from 2008!) does not handle a success reply and then disconnects after a few keepalives. It really needs a failure reply. Since 5.1p1, OpenSSH can handle both failure and success replies to its keepalive channel messages.
Always return a failure reply if the request is "keepalive@openssh.com".
Fixes #709.