Solve Mysterious MacBook Pro Ethernet Cable connection issue

SQL WARRIOR
1 min readMay 29, 2020

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TL;DR I have MacBook Pro 2018. The ethernet cable connection was not working. Searched days of internet and I could not find useful solutions. I ended up solving this by run diagnose when rebooting.

So the problem was caused by:

  1. The adaptor
  2. The local network
  3. The latest updates of MacOS 10.15.5
  4. The network location settings
  5. The ethernet adaptor drivers

The problem was due to the local MacOS settings. I don’t know enough to the details but I solved this issue by run Diagnostics when rebooting.

Per Apple document:

“Turn on your Mac, then immediately press and hold the D key on your keyboard. Keep holding until you see a screen asking you to choose your language. When Apple Diagnostics knows your language, it displays a progress bar indicating that it’s checking your Mac: Checking your Mac takes 2 or 3 minutes.”

After running this Diagnostics tool, I could connect to ethernet cable with Plug-n-Play:

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SQL WARRIOR

AWS Database Consultant. Still have passion on SQL Server since 1998. Expert on SQL Server Performance Tunning, High Availability. VMWare VCP 6/7.