After short power outage involving no lightning, I restarted all my systems and found that DDNS isn't working. I can get to my Blue Iris system using the IP address, but my Dynu doesn't seem to be working.

I'm using a CenturyLink C4000LG router/modem. I've configured DDNS using the following information in the Custom settings:
Server = ns1.dynu.com
Request = /nic/update?
Username = revbilly666
Password = [My Dynu pw]

This has been working for a long time. Please help.

The server name should be api.dynu.com.