Please show:
certbot certificates
also IPv6 problem:
curl -Ii4 chralt.feste-ip.net
HTTP/1.1 301 Moved Permanently
Date: Fri, 22 Apr 2022 14:14:42 GMT
Server: Apache/2.4.38 (Debian)
Strict-Transport-Security: max-age=15552000; includeSubDomains
Location: https://chralt.feste-ip.net/
Content-Type: text/html; charset=iso-8859-1
curl -Ii6 chralt.feste-ip.net
curl: (56) Recv failure: Connection reset by peer