Cloud services fail after modem change

[gatorback]

An Arris modem replaced the Xfinity modem. The Mac on the Wifi returns web pages (i.e. internet is working). The Mac is also able to ping the Honeywell thermostat:

ping -c 3 192.168.8.121

I noticed two services that seem to fail:

* Thermostat display normally reports outside temperature, but now indicates "internet connection lost"
* Asus DDNS connection does not update mydomain.asuscomm.com More details published here:

Immediately forcing DDNS update

Firmware 380.70 DDNS: www.asus.com -> .asuscomm.com Is it possible to immediately force a DDNS update? Maybe from the SSH terminal?

www.snbforums.com

Given that these two similar problems surfaced after changing out the modem. What "root cause" is plausible, so that I can take corrective measures?

 

[Greg72]

Check your IP settings on the new modem to make sure they match the old, same with SSID & Passphrase. Your gateway was changed which means everything associated with the old equipment has now changed. It is not a simple plug and play.