title: Visual studio Code - devcontainer extensions not installing behind VPN
body: <p>I have a devcontainer.json set up with the following property:</p>
  <pre><code>&quot;extensions&quot;: [&quot;esbenp.prettier-vscode&quot;],
  </code></pre>
  <p>Unfortunately, while I'm on VPN; the extension doesn't install (I can install it locally/manually).</p>
  <p>Any thoughts on what could be causing this?</p>