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We've had a few reports of SSH connections bombing out with the following error message, reportedly under heavy load:
PuTTY Fatal Error (X) Disconnected: Received SSH_MSH_CHANNEL_SUCCESS for "email@example.com" [ OK ]
This message has only existed in PuTTY since the 'flow-control' feature was implemented, which was after we released 0.60; so at the time of writing, only people using development snapshots, or third-party code incorporating development code, should be seeing this. We probably want to find out what's going on before we make a release with this feature in.
On the face of it, it looks like the SSH server is incorrectly responding to our unilaterally-defined channel request message with SUCCESS, which it should never do since it's something we made up. (Our documentation mandates a FAILURE response, but that's only a restatement of the RFC 4254 requirement for a FAILURE response to requests that aren't understood -- we don't expect any server to specifically handle this message.)
However, perhaps we're getting confused about the mapping of requests to responses, or something.
Audit trail for this semi-bug.