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<a href="https://gitlab.com/boekhold">Maarten Boekhold</a>
commented:
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<p dir="auto">Trying to revive this...</p>
<p dir="auto">OpenSSL is sending a TLSv1 Client Hello packet, GnuTLS is sending a TLSv1.2 Client Hello, and never receives the Server Hello response. I can see a bunch of retransmissions and then more TLSv1.2 Client Hello with Alert Level Fatal packets, until GnuTLS gives up.</p>
<p dir="auto">I can see as well that GnuTLS is sending more extensions in the Client Hello, but no idea if that is important or relevant in any way.</p>
<p dir="auto">Anybody got any idea why I would not receive any Server Hello response with GnuTLS? It doesn't appear to be caused by the destination server: if I start a VPN connection, the requests work. So there's something in my normal ISP connection that doesn't like this TLSv1.2 Client Hello (or in the specific Server Hello that this Client Hello triggers).</p>
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