[stunnel-users] blackhole problem - please help to tune stunnel

[Michał Trojnara]

Hi Michael,

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.

Some more details:
https://groups.google.com/forum/#!topic/comp.protocols.tcp-ip/vk7uY5dkdpY

Best regards,
    Mike

On 5/28/2020 2:04 AM, Michael S. Chusovitin wrote:
> Dear stunnel users,
>
> please advise how to solve the following:
>
> - an Application connects to stunnel-client (installed at the same
> machine);
> - stunnel-client tries to connect to stunnel-server (remote), fails
> and sends RST to the App;
> - but the App has already sent some datagrams to stunnel-client during
> TIMEOUTconnect period and they aren't transferred to stunnel-server.
>
> Is there any way to make stunnel-client delay its ACK to the App until
> the connection to stunnel-server is established?
>
> Thanks!
>
>
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> stunnel-users at stunnel.org
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