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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1507#note_1601285352">commented</a>:
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">This is caused by a hostname mismatch, according to wireshark:</p>
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<pre data-canonical-lang="console" class="code highlight js-syntax-highlight language-console" lang="console" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: 0.875rem; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="console" style="margin-top: 0;"><span class="go" style="margin-top: 0;">XMPP Protocol</span></span>
<span id="LC2" class="line" lang="console"><span class="go" style="margin-top: 0;"> eXtensible Markup Language</span></span>
<span id="LC3" class="line" lang="console"><span class="gp" style="margin-top: 0;"> <stream:error></span></span>
<span id="LC4" class="line" lang="console"><span class="go" style="margin-top: 0;"> <host-unknown</span></span>
<span id="LC5" class="line" lang="console"><span class="gp" style="margin-top: 0;"> xmlns='urn:ietf:params:xml:ns:xmpp-streams'/></span></span>
<span id="LC6" class="line" lang="console"><span class="gp" style="margin-top: 0;"> </stream:error></span></span>
<span id="LC7" class="line" lang="console"><span class="go" style="margin-top: 0;"> [Expert Info (Note/Undecoded): Unknown packet: error]</span></span>
<span id="LC8" class="line" lang="console"><span class="go" style="margin-top: 0;"> [Unknown packet: error]</span></span>
<span id="LC9" class="line" lang="console"><span class="go" style="margin-top: 0;"> [Severity level: Note]</span></span>
<span id="LC10" class="line" lang="console"><span class="go" style="margin-top: 0;"> [Group: Undecoded]</span></span></code></pre>
<copy-code></copy-code>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">If I specify the correct hostname as with <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>-xmpphost</code> of openssl s_client, that works fine:</p>
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<pre data-canonical-lang="diff" class="code highlight js-syntax-highlight language-diff" lang="diff" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: 0.875rem; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="diff" style="margin-top: 0;"><span class="gh" style="margin-top: 0;">diff --git a/src/socket.c b/src/socket.c</span></span>
<span id="LC2" class="line" lang="diff"><span class="gh" style="margin-top: 0;">index b3ed84c5a3..85a27fc6df 100644</span></span>
<span id="LC3" class="line" lang="diff"><span class="gd" style="margin-top: 0;">--- a/src/socket.c</span></span>
<span id="LC4" class="line" lang="diff"><span class="gi" style="margin-top: 0;">+++ b/src/socket.c</span></span>
<span id="LC5" class="line" lang="diff"><span class="p" style="margin-top: 0;">@@ -240,7 +240,7 @@</span> static void socket_starttls(socket_st *socket)</span>
<span id="LC6" class="line" lang="diff"> snprintf(</span>
<span id="LC7" class="line" lang="diff"> buf, sizeof(buf),</span>
<span id="LC8" class="line" lang="diff"> "<stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:client' to='%s' version='1.0'>\n",</span>
<span id="LC9" class="line" lang="diff"><span class="gd" style="margin-top: 0;">- socket->hostname);</span></span>
<span id="LC10" class="line" lang="diff"><span class="gi" style="margin-top: 0;">+ "molgen.mpg.de");</span></span>
<span id="LC11" class="line" lang="diff"> send_line(socket, buf);</span>
<span id="LC12" class="line" lang="diff"> wait_for_text(socket, "<?", 2);</span>
<span id="LC13" class="line" lang="diff"> send_line(</span></code></pre>
<copy-code></copy-code>
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<p dir="auto" style="color: #333238; margin: 0;" align="initial">I can add a new option to gnutls-cli if it's useful.</p>
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