I don’t have access to the router which is connected and powered up. I won’t get access to the router for another day or two to see if the router updates are successful or not.
Nslookup was still returning the old address.
However, I used a browser to issue the update command to http://ddns.glddns.com/nic/update and got an “ok” response. The address is now correct.
Was the service down during the interval when I had problems? If so and this happens again, what is the best way to report it?