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<a href="https://gitlab.com/TheRealMichaelCatanzaro">Michael Catanzaro</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1771#note_2943262061">commented</a>:
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">OK, I discovered that gnutls-cli actually already supports this via the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>--ca-auto-retrieve</code> option:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">$ gnutls-cli --ca-auto-retrieve app.usmobile.com</span>
<span id="LC2" class="line" lang="plaintext">Processed 393 CA certificate(s).</span>
<span id="LC3" class="line" lang="plaintext">Resolving 'app.usmobile.com:443'...</span>
<span id="LC4" class="line" lang="plaintext">Connecting to '2606:4700::6812:667:443'...</span>
<span id="LC5" class="line" lang="plaintext">- Certificate type: X.509</span>
<span id="LC6" class="line" lang="plaintext">- Got a certificate list of 3 certificates.</span>
<span id="LC7" class="line" lang="plaintext">- Certificate[0] info:</span>
<span id="LC8" class="line" lang="plaintext"> - subject `CN=app.usmobile.com', issuer `CN=Cloudflare TLS Issuing ECC CA 3,O=SSL Corporation,C=US', serial 0x3d7fb41e831e456921073810e12e6290, EC/ECDSA key 256 bits, signed using ECDSA-SHA256, activated `2025-11-12 18:05:49 UTC', expires `2026-11-12 17:47:06 UTC', pin-sha256="70y5eLrafXTVMjbptBrllO9Mw8FW9c2xuofNXy0Qqkc="</span>
<span id="LC9" class="line" lang="plaintext"> Public Key ID:</span>
<span id="LC10" class="line" lang="plaintext"> sha1:edd8ffacf5be4501880ac4d61bb967f84583cb6f</span>
<span id="LC11" class="line" lang="plaintext"> sha256:ef4cb978bada7d74d53236e9b41ae594ef4cc3c156f5cdb1ba87cd5f2d10aa47</span>
<span id="LC12" class="line" lang="plaintext"> Public Key PIN:</span>
<span id="LC13" class="line" lang="plaintext"> pin-sha256:70y5eLrafXTVMjbptBrllO9Mw8FW9c2xuofNXy0Qqkc=</span>
<span id="LC14" class="line" lang="plaintext"></span>
<span id="LC15" class="line" lang="plaintext">- Certificate[1] info:</span>
<span id="LC16" class="line" lang="plaintext"> - subject `CN=Cloudflare TLS Issuing ECC CA 3,O=SSL Corporation,C=US', issuer `CN=SSL.com TLS Transit ECC CA R2,O=SSL Corporation,C=US', serial 0x31eee88afb87cd9ef8336604743f9b27, EC/ECDSA key 256 bits, signed using ECDSA-SHA384, activated `2025-05-29 19:49:45 UTC', expires `2035-05-27 19:49:44 UTC', pin-sha256="44viFzTC+h/L+3OHRg4Rs5v4+AcpzHZvI9Tne2RDNGk="</span>
<span id="LC17" class="line" lang="plaintext">- Certificate[2] info:</span>
<span id="LC18" class="line" lang="plaintext"> - subject `CN=SSL.com TLS Transit ECC CA R2,O=SSL Corporation,C=US', issuer `CN=AAA Certificate Services,O=Comodo CA Limited,L=Salford,ST=Greater Manchester,C=GB', serial 0x00ad8d2df64681a0d36447eaa94fa273c1, EC/ECDSA key 384 bits, signed using RSA-SHA256, activated `2024-06-21 00:00:00 UTC', expires `2028-12-31 23:59:59 UTC', pin-sha256="OXyj9ngbqO9cjLeO/+t9Ggl2EP4JTnVWHq4LEwhFM9w="</span>
<span id="LC19" class="line" lang="plaintext">- Status: The certificate is NOT trusted. The certificate issuer is unknown. </span>
<span id="LC20" class="line" lang="plaintext">*** PKI verification of server certificate failed...</span>
<span id="LC21" class="line" lang="plaintext">*** Fatal error: Error in the certificate.</span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">Unfortunately it still fails to validate. Since browsers can find a valid certification path, ideally GnuTLS would be able to as well.</p>
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