TTS not working when SSL turned on

I have added tts and a dlna_dmr speaker to my configuration.

I have also added base_url to the config of tts. However I still get an error message stating:

2019-08-14 22:02:10 ERROR (MainThread) [homeassistant.core] Error doing job: SSL handshake failed
Traceback (most recent call last):
  File "uvloop/sslproto.pyx", line 500, in uvloop.loop.SSLProtocol._on_handshake_complete
  File "uvloop/sslproto.pyx", line 484, in uvloop.loop.SSLProtocol._do_handshake
  File "/usr/local/lib/python3.7/ssl.py", line 774, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: HTTP_REQUEST] http request (_ssl.c:1076)

Is tried a lot of different things but nothing seems to work. Only turning off ssl entirely in the http component makes tts work (which is not an option for me…).

Do you have an idea?

Attached you find the part of my config:

http:
  base_url: https://xxxxxxx.duckdns.org
  ssl_certificate: /ssl/fullchain.pem
  ssl_key: /ssl/privkey.pem

# Text to speech
tts:
  - platform: google_translate
    cache_dir: /tmp/tts
    base_url: http://192.168.0.53:8123

media_player:
  - platform: dlna_dmr
    url: http://192.168.0.65:8080/description.xml
    listen_ip: 192.168.0.53
    listen_port: 8301