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We now expect that after the server has sent us CHANNEL_CLOSE, we should not expect to see any replies to our outstanding channel requests, and conversely after we have sent CHANNEL_CLOSE we avoid sending any reply to channel requests from the server. This was the consensus among implementors discussing the problem on ietf-ssh in April 2014. To cope with current OpenSSH's (and perhaps other servers we don't know about yet) willingness to send request replies after CHANNEL_CLOSE, I introduce a bug-compatibility flag which is detected for every OpenSSH version up to and including the current 6.6 - but not beyond, since https://bugzilla.mindrot.org/show_bug.cgi?id=1818 promises that 6.7 will also implement the new consensus behaviour. [originally from svn r10200]