Ddclient WARNING: unable to determine IP address

Hello,

first of all, please add ssl=yes to the official instructions at https://dynv6.com/zones/xxxx/instructions.

Then, when I use this config:
/etc/ddclient.conf
ssl=yes
#use=cmd, cmd=‘curl -k -s -6 http://checkip.spdyn.de/
protocol=dyndns2
server=dynv6.com
login=none
password=‘xx’
my.dynv6.net

I get WARNING: unable to determine IP address
I have also tried
usev6=if, if=wlan0
use=web, web=ip.dnshome.der
use=cmd, cmd=‘curl -k -s -6 http://checkip.spdyn.de/

All, without success.

Does anyone have a working configuration?

Best regards,
Hendrik

This is my working ddclient config

daemon=120 #Updateinterval 2min
protocol=dyndns2
syslog=yes
use=web, web=checkip.dyndns.org
server=dynv6.com
#ssl=yes erst ab ddclient 3.7.0
ssl=yes
#login=bertlp5
login=none
password=‘xxx’
hostname.dynv6.net