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There is a house in which there is an internet connection from a cable (People get internet connection in our village from a cable that is under the ground...) going to 2 routers. A cable from one of those routers is going to a device that is connected to an electric socket (Wi-Fi Extender) that is in that house.

Another device (Wi-Fi Hotspot) is connected to an electric socket in another house, in which I live and from which I get internet connection on my phone and on my laptop.

The distance between those two houses is like 20-30 metres.

It has worked fine for the last 7 months.

It stopped working today for some reason and I don't know why.

When I try to connect to internet with my Android phone it says that "It was not possible to assign an IP address."

The people who live in the first house have no problem and their internet works fine.

What can be the problem?

On both devices there is a button called "PAIR" to pair those 2 devices - Wi-Fi Extender in the first house with the Wi-Fi Hotspot in my house. Do I have to press those 2 buttons within 60 seconds on both devices, so that they pair up?

These are those two devices that I am using:

The smaller device is in the first house and the bigger device is in my house.

https://www.amazon.co.uk/TP-LINK-TL-WPA4220KIT-Powerline-Configuration-Smartphone/dp/B00DHB2T44/ref=sr_1_4?keywords=TP-Link+TL-WPA4220&qid=1571068399&sr=8-4

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    It is possible that something about the electrical circuitry between the houses changed. Temporarily connect the electric socket extender in the "other" house to a circuit in the "same" house and see if it works – John Oct 14 '19 at 16:14
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    Which one do you call "Wi-Fi extender" and which one is "Wi-Fi hotspot"? From the link you gave, only the larger device has Wi-Fi at all – the other is wired Ethernet only. – user1686 Oct 14 '19 at 16:15
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    Do you have the TP-Link tpPLC software (or the open-plc-utils package) installed on any computer, on either side? Does it detect both devices? – user1686 Oct 14 '19 at 16:21
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    PLCs sometimes have issues but usually disconnecting from the outlet, waiting a few seconds and reconnecting is enough. – user931000 Oct 14 '19 at 16:42
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    No they don't. They communicate through the mains / power lines (Homeplug AV). – user1686 Oct 15 '19 at 4:24
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So, eventually the ethernet cable was the cause of the problem. I replaced it with a new cable and now it all works flawlessly! :-)

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