<p></p>
<p>Just in case you're coming across this with the recent LetsEncrypt chain update, you can work around this by preferring the shorter chain in <a href="https://community.letsencrypt.org/t/production-chain-changes/150739/1" rel="nofollow">https://community.letsencrypt.org/t/production-chain-changes/150739/1</a> via the lego flags: <code>--preferred-chain "ISRG Root X1"</code>. On NixOS this is provided via:</p>
<div class="highlight highlight-source-nix"><pre>   <span class="pl-v">security</span><span class="pl-k">.</span><span class="pl-v">acme</span><span class="pl-k">.</span><span class="pl-v">certs</span><span class="pl-k">.</span><span class="pl-s"><span class="pl-pds">"</span><span class="pl-mi"><span class="pl-pse">${</span><span class="pl-v">domain</span><span class="pl-pse">}</span></span><span class="pl-pds">"</span></span><span class="pl-k">.</span><span class="pl-v">extraLegoRunFlags</span> <span class="pl-ii">=</span> [
        <span class="pl-s"><span class="pl-pds">"</span>--preferred-chain<span class="pl-pds">"</span></span> <span class="pl-s"><span class="pl-pds">"</span>ISRG Root X1<span class="pl-pds">"</span></span>
   ]<span class="pl-ii">;</span></pre></div>

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