There are several reasons may make you have no Internet connection. Below is a normal topology of powerline network.
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Step 1:
Please make sure the modem or router has Internet connection. You can simply connect a computer to it to have a check.
Step 2:
Please make sure the physical connection is correct. The Ethernet LED should be on.
Step 3:
Please make sure the Powerline LED is light up on your all adapter. If not, please refer to the FAQ_258 to pair them.
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Step 4:
Please check the IP of your computers. It should be in the same segment with your router. Please refer to FAQ_62 to check the IP address.
If you can’t get a correct IP address, please refer to FAQ_89 to configure the IP parameters manually.
If you still can’t get Internet connection after these steps, please feel free to mail us. support@tp-link.com