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Error Message while trying the pairing "Not connected to the internet. Please check your connection and try again"

I habe connection to the internet. Another switch registered on this APP works without problems. 

me too

I have iPhone

My issue exactly. 5 or 6 others work perfectly but can get some new ones or old ones I previously deleted  back on system just get 'Not connected to Internet'.

I have the same issue.

I was first believing, that i am logged in with my mobile in the 5G network, but Im in 2.4Ghz.

I cannot reach the webpage http://cn-long.coolkit.cc/,

but i can reach the other server

How to solve this issue?

I have exactly the same problem, I'm adding my first device and have been struggling for days and the Ewelink app just says "not connected to the internet" which it is. 

 I've done some checking and the http://cn-long.coolkit.cc/ servers are down and not contactable.

It's getting to the point where I'm going to send the device back, which is a shame because the build quality is really good just a shame about the wifi configuration being awfull.

I have the same problem, just installed my Sonoff POW R2 and can't connect to it

Is this an iPhone only problem? 

I can confirm that this seems to be "only" affecting iPhone users.

I was able to connect my Sonoff POWR2 via an Android phone to my account, and now I can work with it on my iPhone

What I have done will invalidate the warranty, and stops the unit from using the eWeLink servers.

BUT it gives me what I wanted, which is direct access to the switches via an Alexa device with voice control and Alexa App.

The best video I've found so far to explain what needs to be done is:

https://www.youtube.com/watch?v=08_GBROKQH0

I have the Sonoff 4CH R2:

https://www.amazon.co.uk/HiLetgo-FT232RL-Converter-Adapter-Breakout/dp/B00M4984JY/ref=pd_ybh_a_24?_encoding=UTF8&psc=1&refRID=13Y8SD41KJD69ACZF8TR

I used the following USB to Serial Converter: 

https://www.amazon.co.uk/HiLetgo-FT232RL-Converter-Adapter-Breakout/dp/B00M4984JY/ref=pd_ybh_a_24?_encoding=UTF8&psc=1&refRID=13Y8SD41KJD69ACZF8TR

Male Pins for the circuit board:

https://www.amazon.co.uk/gp/product/B07QCL7MY8/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

Dupont Wires to hook everything together:

https://www.amazon.co.uk/gp/product/B01EV70C78/ref=ppx_yo_dt_b_asin_title_o05_s01?ie=UTF8&psc=1

NodeMCU PyFlasher: (Both MAC and PC 32/64bit)

https://github.com/marcelstoer/nodemcu-pyflasher/releases

Tasmota Firmware:

https://github.com/arendst/Tasmota/releases

SonOff Templates:

https://blakadder.github.io/templates/

The only other thing you'll need is the USB cable which you may already have around the home:

https://www.amazon.co.uk/AmazonBasics-USB-Male-Mini-B-Cable/dp/B00NH13S44/ref=sr_1_2_sspa?adgrpid=54784783898&gclid=Cj0KCQiAiZPvBRDZARIsAORkq7eb-HoTfoOLk5VK75-oQL9ULSKbvJqWxKxBWAuYaO1A-UBzCnrMR0IaAtGnEALw_wcB&hvadid=259043571047&hvdev=c&hvlocphy=1002316&hvnetw=g&hvpos=1t3&hvqmt=e&hvrand=15718803077949105351&hvtargid=kwd-302517247581&hydadcr=5082_1827835&keywords=usb+to+mini+usb+lead&qid=1575284057&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyMTM3Q1lHSDVOSFA4JmVuY3J5cHRlZElkPUExMDMwMTQ1MUZXVU1PMzVHNFEyViZlbmNyeXB0ZWRBZElkPUEwOTI5MDYwUjZCNlJFVUdJWE8yJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

Once you have flashed and rebooted, scan the network for the device' IP address and browse to it configure as per the video above with applying the right template for the device, it was really straight and all 4 switches are visible to Alexa which is what I wanted.

Hope this helps point you in the right direction.