Hello, Yeelight team!
Some time ago I lost connection to my Yeelight ceiling LED. Yeelight app showed device disconnected and I decided to reset LED device and reconnect again.
But I have an issue with new connection too:
- Yeelight ceiling LED has been reset
- I discovered device by Yeelight app and trying to connect
- I prescribed my wifi ssid and password in app for further work LED with my wifi
- The wifi ssid yeelink-light-ceilc_mibtC857 is appeared in wifi net’s list
- I connected to yeelink-light-ceilc_mibtC857 and ceiling LED has blink become
- This wifi net suddenly disappears and Yeelight app notifed that can’t connect to ceiling LED, reconecting is unsuccessful too
I see on router that ceiling LED connected to my Wi-Fi and got IP address from DHCP and avalible by ping, but Yeelight app can’t see it 
Plz, help
You can try to fill in your home wifi password first, and then connect to the wifi signal of yeelink-light-ceilc_mibtC857, and then return to the yeelight app immediately!
Yes, I’ve done it before. I see that ceiling LED is connected to my wifi network (I see ping reachability of device). But when LED has connected to wifi, wifi signal of led is lost
I suspect network unreachability with your servers as a possible root cause. Can you tell me what IP’s/domains and TCP/UDP port, where ceiling LED should be connect? (Moscow server is chosen in Yeelight app, but I tried and another one, but it’s not solved an issue)
And it possible to connect to ceiling LED through SSH/telnet for troubleshooting (I suppose linux embedded system or something else inside?)
@jerry-yeelight Hello, team!
So, it seems I was right the problem has been related with DNS unreachability of ru.ots.io.mi.com, I fix it and LED has been connected successfully!