October 23, 2025Oct 23 Since last night, my Unraid server hasn't been accessible at the usual network address. When I ping it, nothing happens. The network cable works because I've tried it on two different computers. The network card on the motherboard doesn't light up when I connect the cable (no orange/green light, just nothing). I've tried rebooting several times, but the network still doesn't work.I'm on Unraid 7.0.0, the Motherboard is Gigabyte B460 HD3 and the Network adapter is Realtek Semiconductor Co., Ltd. RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller and I had a couple of connection problems before (since I upgraded to 7, the speed went down to 100mbps a couple of times but I just rebooted and it worked again)Is the NIC gone? I have to buy a pcie card? Edited October 23, 2025Oct 23 by yossarian82
October 23, 2025Oct 23 Community Expert Solution 22 minutes ago, yossarian82 said:7, the speed went down to 100mbps a couple of timesThis is typical of a LAN cable where not all 4 twisted pairs make end-to-end contact. The 100Mbs speed only requires 2 of them to be operational so you can see a silent degradation from the expected 1Gps to 100Mbps. If it is not the cable itself that is faulty then it can be an issue if the socket the cable plugs into is not connecting all pins. Not sure if there is a failure mode of the LAN card/chips that can cause similar symptoms.
October 23, 2025Oct 23 Author I thought this could be the case but I tried with a usb adapter on my laptop and with a minipc and the cable works. I even did again the cabling, crimping again both the ends.
October 23, 2025Oct 23 Community Expert 1 hour ago, yossarian82 said:I thought this could be the case but I tried with a usb adapter on my laptop and with a minipc and the cable works. I even did again the cabling, crimping again both the ends.It could be the onboard NIC, but worth checking the physical LAN port on the PC end to check there is no bent pin or something similar.
October 23, 2025Oct 23 Author 3 hours ago, itimpi said:This is typical of a LAN cable where not all 4 twisted pairs make end-to-end contact.It was that! I re-wired both ends and now it works. Sorry for bothering you.It's strange, anyway, that with the old cable the gigabit connection worked flawlessy on two different computers.
October 23, 2025Oct 23 Community Expert 21 minutes ago, yossarian82 said:It's strange, anyway, that with the old cable the gigabit connection worked flawlessy on two different computers.If there was a broken/cracked wire then it could depend on exactly how the cable was oriented as to whether the ends of the broken bits ended up touching.At least the symptoms matched up with the commonest cause 🙂
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