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<p>Hi Michael,</p>
<p>No, there is no portable way of implementing this feature. In
fact, the OS kernel only notifies server applications (including
stunnel) about a new incoming connection *after* the three-way TCP
handshake has completed.<br>
</p>
<p>Some more details:<br>
<a class="moz-txt-link-freetext" href="https://groups.google.com/forum/#!topic/comp.protocols.tcp-ip/vk7uY5dkdpY">https://groups.google.com/forum/#!topic/comp.protocols.tcp-ip/vk7uY5dkdpY</a></p>
<p>Best regards,<br>
Mike<br>
</p>
<div class="moz-cite-prefix">On 5/28/2020 2:04 AM, Michael S.
Chusovitin wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAC-YOF4FyKWy30iME=aeZpvkdt-Ob8VaBCaoJKKkF3SW4pEcaA@mail.gmail.com">
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<div dir="auto">Dear stunnel users,
<div dir="auto"><br>
</div>
<div dir="auto">please advise how to solve the following:</div>
<div dir="auto"><br>
</div>
<div dir="auto">- an Application connects to stunnel-client
(installed at the same machine);</div>
<div dir="auto">- stunnel-client tries to connect to
stunnel-server (remote), fails and sends RST to the App;</div>
<div dir="auto">- but the App has already sent some datagrams to
stunnel-client during TIMEOUTconnect period and they aren't
transferred to stunnel-server.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Is there any way to make stunnel-client delay
its ACK to the App until the connection to stunnel-server is
established?</div>
<div dir="auto"><br>
</div>
<div dir="auto">Thanks!</div>
<div dir="auto"><br>
</div>
</div>
<br>
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</pre>
</blockquote>
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