title: Let's Encrypt on Android gives java.security.cert.CertPathValidatorException: Trust anchor for certification path not found
body: <p>Hi have setup a small serve, generated a free certificate from Let's encrypt and configured Nginx to use that certificate (fullchain.pem and privkey.pem)</p>
  
  <p>However, when I attempt to make a call from my Android app (with OkHttp3)
  I get this error</p>
  
  <pre><code>java.security.cert.CertPathValidatorException: Trust anchor for certification path not found
  </code></pre>
  
  <p>Is Let's encrypt root certificate not trusted by the Android cert trust store? Or did I miss something when setting up nginx?
  What is a work around for this If i still want to use Let's encrypt certificates?</p>