Visitor
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2 Messages
Honeywell thermostat no longer connects to Xfinity Wi-Fi
On 6/30/25 my honeywell thermostat dropped its connection to my xFinity router. It has been functioning fine for nearly 2 years. I've restarted both the thermostat and router, and attempted reconnecting 4 times. Message is that the connection attempt has timed out. I called Honeywell support (Resideo) and they suggest perhaps their IPs need to be white listed by xfinity. Not sure why this would be so all of a sudden but that is where things stand. Everything else connects just fine to the router.
Here are the IPs Honeywell suggests whitelisting:
If there is a firewall, make sure the thermostat can connect to the following connection points:
TCC – App/ Portal Devices
tccprod01.resideo.com - 20.7.235.10
tccprod02.resideo.com - 20.62.30.72
tccprod03.resideo.com - 20.62.29.159
lyric.alarmnet.com
chil.cloudapp.net
*Network Admins can "whitelist" these endpoints within the Security or Network settings of their networking equipment*
Any suggestions?
Accepted Solution
XfinityJustinM
Official Employee
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136 Messages
3 days ago
Hi @user_mt4cm3, thank you for taking the time to bring your issue to our community forums. Often these types of smart home devices prefer to be connected to the 2.4GHz band rather than the 5Ghz band. While your Xfinity modem by default attempts to select the correct band for each device to be successful, at times changing this setting manually is your best bet. I will place some instructions below on how to adjust these settings, and that should do the trick.
Sign in to the Xfinity app with your Xfinity ID and password.
Select Wi-Fi (from the bottom navigation on the Xfinity app).
Select Wi-Fi details.
Select edit Wi-Fi settings.
Turn on split bands.
I would recommend renaming each band, so you have a clear distinction between the two. It could be as simple as putting a 2.4 or 5 at the end of the name.
Please let me know if this gave your Honeywell thermostat the ability to connect again. 😃
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