Unable to connect to Mattermost server using Android phone

  1. Check https://www.ssllabs.com/ssltest/index.html first for the SSL cert issue and it should comment that its incomplete/wrong ordering chain.
  2. Check https://ssldecoder.org/ for a suggested correct ordering of SSL cert chain and save the recommended ordering as an .pem file
  3. Load into your mattermost server and perform sudo service nginx restart