C203 - DynDNS not working anymore

After the upgrade to Core 203, unfortunately DynDNS does not do updates any more. ddns -d update-all --force gives the following result:

...
Registered new provider: Zoneedit (``zoneedit.com``)
Registered new provider: zzzz (``zzzz.io``)
Running on distribution: ipfire-2
Loading configuration file /var/ipfire/ddns/ddns.conf
Updating <username> forced
Sending request (GET): ``https://checkip4.dns.lightningwirelabs.com
Request header:
User-agent: IPFireDDNSUpdater/014
Pragma: no-cache
Logging failed update for <username>: DDNSConfigurationError: The configuration file has errors
Opening database /var/lib/ddns.db
Dynamic DNS update for <username> (Duck DNS) failed:
DDNSConfigurationError: The configuration file has errors

I removed and recreated the single entry i have configured in Current hosts, but without any effect.

Any ideas how to fix this issue?

For some reason, switching from 8.8.8.8 (Google) to 1.1.1.1 (Cloudflare) as nameserver solved this issue… :man_shrugging: