Lets Encrypt SSL Problem

My domain is: dxzn-smm.de

Hello I have a Problem when i go to CPanel and click Lets Encrypt SSL and choose dxzn-smm.de and www.dxzn-smm.de when i get the Error Message:

Hi @dxzn, welcome to the LE community forum :slight_smile:

There seems to be an issue with the IPv6 access to your site:

curl -Iki4 http://www.dxzn-smm.de/
HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 336
Connection: keep-alive
Keep-Alive: timeout=15
Date: Mon, 13 Sep 2021 17:42:30 GMT
Server: Apache
Last-Modified: Tue, 03 Aug 2021 10:17:26 GMT
ETag: "150-5c8a4fe183e55"
Accept-Ranges: bytes

curl -Iki6 http://www.dxzn-smm.de/
HTTP/1.1 403 Forbidden
Connection: close
Content-Type: text/html
Cache-Control: no-cache
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Content-Security-Policy: frame-ancestors 'self'
Content-Length: 3447
Name:      www.dxzn-smm.de
Addresses: 2001:8d8:100f:f000::26a
           217.160.0.111

Name:      dxzn-smm.de
Addresses: 2001:8d8:100f:f000::26a
           217.160.0.111

And how can I fix it?

Start with the outputs of:

curl -4 ifconfig.co
curl -6 ifconfig.co
sudo apachectl -t -D DUMP_VHOSTS
sudo netstat -pant | grep -i listen

[the problem is likely within the apache config]

Any news?