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Date:	Mon, 8 May 2023 13:12:19 +0300
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Message-ID:	<1065214503.20230508131219@yandex.ru>
To:	Yuri <yuri AT rawbw DOT com>, cygwin AT cygwin DOT com
Subject:	Re: OpenSSL failure in Cygwin: SSL_set_tlsext_host_name returns 1
	(SSL_TLSEXT_ERR_ALERT_WARNING)
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From:	Andrey Repin via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Andrey Repin <anrdaemon AT yandex DOT ru>
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Greetings, Yuri!

> I've built the proxytunnel project in Cygwin
> (https://github.com/proxytunnel/proxytunnel).

> It is usually used to tunnel ssh through https using the https CONNECT command.


> The command "proxytunnel --no-check-certificate -E -p
> {https-proxy-host}:{https-proxy-port} -d 127.0.0.1:22" works on Linux and BSD.


> However, it fails in Cygwin with the exit code 1
> (SSL_TLSEXT_ERR_ALERT_WARNING), which causes this error message in proxytunnel:

 >> SSL_set_tlsext_host_name returned: 1 (0x1). TLS SNI error, giving up

This error means that a connecting party had sent server name which server did
not acknowledge.

> This prevents proxytunnel from being able to connect to the remote peer.


> What might be wrong?

If possible, I would look at the protocol log for connection, if I were you.


-- 
With best regards,
Andrey Repin
Monday, May 8, 2023 13:09:25

Sorry for my terrible english...


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