Setup Gunicorn with let's encrypt cert

Question

To secure my website, I've used Let's encyprt certbot for generating privkey.pem, cert.pem, chain.pem, and fullchain.pem

When I connect my website from desktop chrome or firefox, it seems to be ok. but when I connect mobile browser such as chrome-android, It blocks connection and shows untrusted certificate authority.

I'm using Django==1.9.7 and gunicorn==19.6.0. and Here is my gunicorn configuration file:

bind = '0.0.0.0:443'
workers = 4
worker_class = 'gevent'
worker_connections = 1000
keepalive = 5

keyfile = 'privkey.pem'
certfile = 'cert.pem'

What am I missing?

Answer 1

I've resolved this issue myself. The problem was caused by missing key chain file in the gunicorn configuration.

So, currently my configuration file is:

bind = '0.0.0.0:443'
workers = 4
worker_class = 'gevent'
worker_connections = 1000
keepalive = 5

keyfile = 'privkey.pem'
certfile = 'cert.pem'
ca_certs = 'chain.pem'