I disabled the service. I don't need sme to update my ip for my dyndns.com service.
But if it's helpful to you, I looked at the values stored in the db with the command "config show DynDNS", and everything was correct.
It might be related: my efw firewall has a dyndns update service built in, and that stopped working too.
I use a custom domain name at dyndns.com. They host the dns records for my own domain name - its not one of their free ones.
By the way, I use their latest windows update client running on one of my servers, and that works well.
Maybe they've changed their site enough to break it?