Connection refused with enabled SSL

[MisterPascal]

Hi, I've installed CouchDD on a Ubuntu 20.04 server. I can connect from remote to it by using http://myip:5984.
Now I want to enable SSL. As read in the docs I changed the local.ini file:

[chttpd]
port = 5984
bind_address = 0.0.0.0
[ssl]
enable = true
cert_file = /opt/couchdb/folderToFiles/cert.pem
key_file = /opt/couchdb/folderToFiles/privkey.pem
cacert_file = /opt/couchdb/folderToFiles/fullchain.pem

After restarting the couchdb I'm not able to access Fauxton anymore. Also I'm not getting any welcome message more:

@localhost:~# curl https://0.0.0.0:6984
curl: (7) Failed to connect to 0.0.0.0 port 6984: Connection refused
@localhost:~# curl http://0.0.0.0:5984
curl: (7) Failed to connect to 0.0.0.0 port 5984: Connection refused

If I disable ssl by set ;enable = true I get the normal welcome message on port 5984.

I checked my ports also:

To                         Action      From
--                         ------      ----
5984                       ALLOW IN    Anywhere
6984                       ALLOW IN    Anywhere
443/tcp                    ALLOW IN    Anywhere
22/tcp                     ALLOW IN    Anywhere
5984 (v6)                  ALLOW IN    Anywhere (v6)
6984 (v6)                  ALLOW IN    Anywhere (v6)
443/tcp (v6)               ALLOW IN    Anywhere (v6)
22/tcp (v6)                ALLOW IN    Anywhere (v6)

And I opened both ports 5984 and 6984 from the server provider too.

Can anyone help me to get a ssl connection running here?
TY