[Bug 217637] One TCP connection accepted TWO times

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217637

--- Comment #64 from Michael Tuexen <tuexen at freebsd.org> ---
(In reply to slw from comment #63)
> Accepted RST can cause silent, immediatly closing connection by client.
> No acknowledged will be sent to server (in case of serevr responce will be
> delivered to client) and server will be retransmit response until also got RST.
No. The server sends a RST and move the connection to CLOSED. The connection is
terminated immediately from the server perspective.
> In case of responce not delivered to client responce will be lost and no chance
> to deleivered.
> Sending RST is ok in case RST accepted and processed after client sent ACK
> so server FIN (FIN, not server data). Need test this on real clients
> (Linux, windows, android and iOS).
No. This is an ungraceful termination. No need to wait for anything. All peers
should
handle the RST.

> Server can do graceful termination of this TCP connection and no reason to
> don't do this (application do gracefull close and only rare combination
> of packet loss case this behaviour).
No. Incoming user data is lost on the server side. I think the server should
notify
the peer as soon as possible. Please note that the RST is only sent if the
server
has to drop user data. If that is not the case, a graceful shutdown will be
performed.

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