![]() I swapped the ethernet cords just in-case. The USB ethernet connects at 1Gbps no problem. I have a Windows 10 PC right next to this, and it works at 1Gbps no problems. I even plugged a USB 3.0 1Gbps ethernet adapter into the system, and it connects at 100Mbps. I completely wiped the system clean and installed a fresh macOS install. It never failed to connect at 1Gbps before the macOS update. but only AFTER updating to macOS High Sierra. Interesting thing to note, even Windows 10 running in BootCamp failed to connect faster than 100Mbps. I update the OS and boom, the network is stuck at 100Mbps. ![]() It's has a perfectly functional 1Gbps ethernet for years. Upon finishing the update, the network will not connect faster than 100Mbps. ![]() Nobody bumped the desk, the iMac, the network switch, or anything. After months and months, I finally updated MacOS from Sierra to High Sierra.
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