Apple company has unhealthy tradition of first releasing the update, and then quickly fix it because of problems. This time the problem arose with the Ethernet-connection. 031-51913 update that fixes some security issues, at the same time to fix a wired internet connection, in fact, disabling the Ethernet-ports in the iMac, and the MacBook Pro.
The company has already officially recognized the problem and on the support website posted a document describing what to do. In the case of the availability of Wi-Fi still is relatively simple - Incompatible Kernel Extension Configuration Data, which causes the problem, it will be updated to version 3.28.2 (the problem occurs on 3.28.1). If this can not be done or for some reason, the system does not download the update itself, the terminal is recommended to update the system manually.
After rebooting, the problem will disappear. Related Products :
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