@terziyski The WAN Port is the culprit for this issue and now the issue was resolved by TP Link Service Center they just replace my faulty router to newer one.

@terziyski I tried that but unfortunately the negotiation speed didn't not change to (1000mbps Full Duplex) if I force to change the settings from auto negotiation to 1000mbps it's show no ethernet...

@terziyski How to check my WAN Port is damaged or not. I don't have any ethernet supported devices I have only wireless devices. I have only one ethernet cable coming from the isp.

@GeorKhawam Yeah my ethernet connector have 8 individual wire and it was properly crimped. Even aslo I was checked in my another Wi-Fi router it was successfully detected 1000mbps.

WAN Port is not detecting (1000mbps Full Duplex). When I connect ethernet cable in auto negotiation mode it was detecting only (100mbps Full Duplex). I tried to change from auto negotiation to...

Thank you 😊👍