Red light but all working?
My better half burnt the toast at the weekend and tripped the power.
After resetting the electrics, everything booted back up and wifi / internet connectiomn re-established as I'd expect.
However, the main Deco (which acts as router on a fibre installation) is showing a red light, and the app continually tells me it has no internet connection. Even though throughout the house all wifi-only devices are all working perfectly fine.
A few reboots of the device hasn't changed anything.
My guess is that the M4 is trying to poll the TP Link servers to confirm everything is A-OK and presumably failing.
What would be the right debugging steps to be advised?
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Hi, can I have the firmware version of the Deco M4?
Did you set Deco into "Access Point" or "Wireless router" mode?
Have you tried unplugging the Ethernet cable between the main Deco and the ISP modem, and restarting the ISP modem once, then plugging the internet cable back?
-If the Deco is under wireless router mode, it is also recommended to refer to this link to set the IPV4 DNS to 8.8.8.8/8.8.4.4:
How to change DNS server settings on my Deco
Wait for your reply.
Best regards.
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@David-TP Thanks David - your note prompted me to look at the DNS settings, and surprisingly to me they were set as blank (I've always had OpenDNS as the provider in there so that surprised me). Temporarily set to auto assign and the red light is cleared.
No idea how the DNS ended up blank though - I've not touched the DNS settings for a long time and I'm the only use with access in the household to the router.
Now I just need to work out why the app pretty much constantly thinks my satellite M4s are disconnected when they quite clearly are working fine!!
All devices are on 1.8.0 Build 20250721 Rel. 49216 and the main device operates in Wifi Router mode with the DHCP server switched on in the router, but limited to start and end at 192.168.1.100 through to 192.168.1.250 just so I can isolate the lower range to some devices which need static IP addresses setting on the device. The DHCP server also distributes the OpenDNS server info to DHCP clients.
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Hi, thank you very much for the update.
Do you mean now all Deco M4 units are solid white, but Deco App still reports all satellite M4 units are offline?
It is recommended to manually update to the latest 1.8.2 firmware version to see whether it helps:
https://www.tp-link.com/en/support/download/deco-m4/v2/#Firmware
After the firmware upgrade, if all satellites but the main Deco M4 are still offline, please help me submit the Deco App log here:
Best regards.
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@David-TP yes, exactly that.
All devices show white light
All devices can be connected to directly via their IP address
Deco app shows all of them "offline"
But all devices that are connected to them are working fine
Yesterday I used a pin to remove them and return them to their blue light status. I successfully readded them all and the issues persists.
I wish there was an entirely local way to access config on both the main deco and the satellite devices as the cloud management tool constantly seems to have issues with both the speed of the update and the accuracy / consistency of what it reports. This has been consistent over several different isps, different ADSL modems and now over the directly connected fibre.
The real annoyance is that actually the deco units themselves are very robust, always work as expected and give great speeds around the house. But the cloud management is so slow, inaccurate or ineffective it is frustrating if I am ever trying to resolve local network issues.
I will manually update all devices to 1.8.2 over the weekend and see if that resolves the issue.
Thanks for your help!
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