I have many TP-Link, eWeLink, and Smart Life devices connected to my home network. I recently installed a new router. All the installed devices connected to the new router without any problem. But, any new device: TP-Link mini switches, eWeLink relay boards, etc. will not connect. Pairing times out and no connection.
Yes, the WiFi password is correct and I have done the unplug and plug back in the router and modem. Still will not connect. Router and phone are on 2.4
Any ideas as what could be set wrong in the new router that is stopping devices from connecting?
Ran into an electronics friend. He said check advanced>security>access control. Control was not on and allow all new devices to connect. Once done all eWeLink relay boards now connect with out any problems.
Problem solved.
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Have the same issue since I replaced a cheap Pix-Link AP with a TP-Link EAP615-Wall (same SSID and password the previous AP).
Most of the devices did reconnect without any issue, but my DW2-Wi-Fi-L refuses to reconnect, even deleting and trying to re-connect doesnt help.
Then I tried to connect a Sonoff R2, get detected, but at the process registering to wifi, it fails.
Im am 100% sure that it is related to the AP setting but cant find it. When I pair trough another AP or the old-one all is OK.
I canot find in the TP-Link settings something related to “access control” can any one please help.
Of course I have the latest firmware and uncheck MAC filtering and the basics. But seems more default parameters are critical. Could it be one of these ?
Could anyone please guide/help me ?
Hmm I’m not sure if I can help you in this case.
The only thing I remember is that I once had a problem connecting I think S26R2 to a certain router and regardless of the settings I couldn’t maintain a stable connection.
Changing to another one helped… I don’t use tp-link so it’s hard for me to guess… from what I remember I had some problems connecting some sonoffs to OpenWrt but here the problem was solved by using the option “Allow legacy 802.11b rates” but I suspect that tp-link may not have a similar one.
Of course make sure that your sonoff has correctly saved the data of the wifi network to which it should connect. If the router has logs, check if any connection is taking place.
If it connects to the router, also check if the device is receiving IP addressing from dhcp.
In addition to this proposal from Morgan, OP please also check the encryption method, which shall be the same as the previous AP.
Thanks for help… I give up for the moment.
I reduced the channel to 20Mhz, tried several channels, forced AES encryption… spend hours on forums, others have also this problem with Sonoff devices but seems there’s no solution.
A good night sleep and it might fall into work tomorrow 
There is a risk that this may be a compatibility problem DW2 chip vs router chip.
I once had such a situation with a TP-Link 5Ghz USB wifi card… Regardless of the settings, it was impossible to establish a connection with the router. In the end, it turned out to be a bug on the ISP router side and without a deep software fix, nothing can be done about it on the user’s side. Of course, the same card worked fine with another router.
I had a similar problem with the previously mentioned S26R2, which also had problems with one router. It constantly dropped the wifi connection after a few seconds and nothing could be done about it. It works fine with another router.
Here are my 2.4G wifi settings, with which my Sonoff products connect without a problem. But I use OpenWrt + Netgear, so it probably won’t help you much.
