How to Disable or Enable NIC on a Mac

If your Mac's Ethernet connection suddenly drops and you are unable to access the Internet, one of the troubleshooting steps that may resolve the issue is disabling and enabling the Network Interface Card (NIC). This causes Mac OS X to turn the hardware off and on, triggering the NIC to reconnect to the network and obtain a new IP address. Disable and enable the NIC through the "Network" pane of the System Preferences menu.

Step

Click the Apple icon in the upper-left corner of the screen, and select "System Preferences."

Step

Click the "Network" icon to open the Network Preferences pane.

Step

Click "Ethernet" on the left side of the window.

Step

Click the gear-shaped button next to the minus sign in the lower-left corner of the window, then click "Make Service Inactive."

Step

Click the "Apply" button to disable the NIC.

Step

Click the gear-shaped button again, click "Make Service Active" and click "Apply" to enable the NIC.