1] Verify Cable2] Verify Ethernet Ports3] Re-Enable Network Adapter4] Disconnect External Wi-Fi Adapter5] Run Network Adapter Troubleshooter6] Change Speed & Duplex7] Reset Network AdapterIt is probably the first thing you need to check before heading to the next step. If you have a faulty cable, you cannot fix this problem anyway. Therefore, you need to verify if the cable is in working condition or not. For that, you can connect this cable to another Wi-Fi router or computer and check if you can access the internet or not. If yes,...See more on thewindowsclub Fluke Networks
Troubleshooting Fiber - Fluke Networks
If there is loss on all fibers in the cable, this is a good indication that the cable is damaged or kinked. If there is loss on a single fiber, the problem is more likely
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