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

Michał Trojnara Michal.Trojnara at stunnel.org
Thu May 28 09:13:47 CEST 2020

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:

Best regards,

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!
> _______________________________________________
> stunnel-users mailing list
> stunnel-users at stunnel.org
> https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.stunnel.org/pipermail/stunnel-users/attachments/20200528/1a9e4a59/attachment-0001.htm>

More information about the stunnel-users mailing list