title: Expo tunnel not working (invalid certificate)
body: <p>I'd like to use <code>expo start --tunnel</code> to allow connecting to the App over the internet.</p>
  <p>However, right after starting, the DevTools open and show me the following error:</p>
  <pre><code>Error loading DevTools
  
  ValidationError: &quot;urlType&quot; must be one of [exp, http, redirect, no-protocol]
  </code></pre>
  <p>The console shows me:</p>
  <pre><code>Starting Metro Bundler.
  Tunnel URL not found (it might not be ready yet), falling back to LAN URL.
  Tunnel URL not found (it might not be ready yet), falling back to LAN URL.
  </code></pre>
  <p>So far so bad.. I've then looked into the <code>.expo/packager-info.json</code> to see what URLs have been generated. The file looks like this:</p>
  <pre><code>{
    &quot;devToolsPort&quot;: 19002,
    &quot;expoServerPort&quot;: 19000,
    &quot;packagerPort&quot;: 19001,
    &quot;packagerPid&quot;: 7316,
    &quot;expoServerNgrokUrl&quot;: &quot;https://sz-p2a.anonymous.123.exp.direct&quot;,
    &quot;packagerNgrokUrl&quot;: &quot;https://packager.sz-p2a.anonymous.123.exp.direct&quot;,
    &quot;ngrokPid&quot;: 5316,
    &quot;webpackServerPort&quot;: null
  }
  </code></pre>
  <p>Then I've tried to open these URLs on the target devices. When doing so, I get an <code>SSLPeerUnverifiedException</code> because of an invalid certificate. I think it's the same error that I get when navigating to the URL directly in the browser.</p>
  <p>So, am I doing anything wrong or is the tunnel workflow broken right now?
  What might I do to get it working?</p>