How can I solve the problem of wired Internet access failure on mac?

Cause analysis

This seems to be because of a patch upgrade problem. Specifically, the security upgrade name is "031-51913 Incompatible Kernel Extension Configuration Data 3.28.1". It will list the Broadcom BCM5701 NIC driver as a blacklist, we cannot access the Internet over the wired network. To solve this problem, we can add it to the White List.

Solution

Click "about local computer"> "system report"> "software"> "installation" in mac to check whether there is a security update with version 3.28.1, as shown in the figure.

After we add them to the whitelist, we will be able to access the internet. After entering the whitelist, we will not be able to access the internet. I hope this tutorial will help you.