CertPathValidatorException connecting to a Let's Encrypt host on Android M or earlier

Question

[edit: If you are here for Let\'s Encrypt expiry event from January 2021, read this first https://letsencrypt.org/2020/12/21/extending-android-compatibility.html]

Answer 1

For Let's Encrypt expiry event from January 2021, this is no longer required.

Read https://letsencrypt.org/2020/12/21/extending-android-compatibility.html before applying.