Please add support for inwx dyndns service.

https://www.inwx.de/
Update-URL: https://dyndns.inwx.com/nic/update?myip=(ipaddr)&myipv6=(ip6addr)

We support the DynDNS2 protocol via HTTPS.
To update your domain, you must in many cases provide an update URL in your client (e.g. router).
With the additional "myipv6" parameter our DynDNS service is also fully IPv6 capable.

or It would be nice if some one could post a working config since for me errors out every time.
I use this following docker container -> https://hub.docker.com/r/linuxserver/ddclient

WARNING: file /var/cache/ddclient/ddclient.cache, line 3: Invalid Value for keyword 'ip' = ''
WARNING: cannot connect to https:443 socket: Name does not resolve IO::Socket::IP configuration failed
FAILED: updating ddns.byteframe.de: Could not connect to https://dyndns.inwx.com.

daemon=150				# check every 300 seconds
syslog=yes				# log update msgs to syslog

#pid=/var/run/ddclient/ddclient.pid		# record PID in file.
ssl=yes 				# use ssl-support.  Works with

protocol=dyndns2
use=web, web=https://ipv6.nsupdate.info/myip
#use=if, if=br0
#if-skip=Scope:Link
ipv6=yes
server=https://dyndns.inwx.com
login=XXXXXXXXXX
password=XXXXXXXXXXXXX
subdomain.abc.de