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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented:
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<blockquote dir="auto">
<p>OpenSSL-linked curl works fine [...]</p>
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<p dir="auto">I guess the best way to diagnose this kind of issues would be to do a packet capture and compare the exchanged messages. That may require enabling decryption, which should be possible through the keylog file feature.</p>
<p dir="auto">Here is a tshark command line I use:</p>
<pre class="code highlight js-syntax-highlight console" lang="console" v-pre="true"><code><span id="LC1" class="line" lang="console"><span class="gp">$</span><span class="w"> </span>tshark <span class="nt">-o</span> <span class="s2">"tls.desegment_ssl_records: TRUE"</span> <span class="se">\</span></span>
<span id="LC2" class="line" lang="console"> <span class="nt">-o</span> <span class="s2">"tls.desegment_ssl_application_data: TRUE"</span> <span class="se">\</span></span>
<span id="LC3" class="line" lang="console"> <span class="nt">-o</span> <span class="s2">"tls.keylog_file: </span><span class="nv">$PWD</span><span class="s2">/keylog.txt"</span> <span class="se">\</span></span>
<span id="LC4" class="line" lang="console"> <span class="nt">-i</span> lo <span class="nt">-Px</span> <span class="nt">-O</span> tls <span class="nt">-Y</span> <span class="s2">"tcp.port == 443"</span></span>
<span id="LC5" class="line" lang="console"></span>
<span id="LC6" class="line" lang="console"><span class="gp">$</span><span class="w"> </span><span class="nv">SSLKEYLOGFILE</span><span class="o">=</span><span class="nv">$PWD</span>/keylog.txt gnutls-cli ...</span>
<span id="LC7" class="line" lang="console"><span class="gp">$</span><span class="w"> </span>openssl s_client <span class="nt">-keylogfile</span> <span class="nv">$PWD</span>/keylog.txt <span class="nt">-connect</span> ...</span></code></pre>
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