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Open Android Settings
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Open Network settings
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Scroll down to 'IP Settings' and make sure DHCP is enabled
- Scroll to 'Proxy Settings' in the Network settings and make sure it is set to None
- Uninstall any DNS or VPN app from your device
- Disable IPv6 option in Android Settings and test again
- Disconnect LAN cable, reboot the router and reconnect LAN cable to your device.
Finally, if none of the above steps solves your Ethernet issue, factory resetting and test again: