iMac iPhone USB Internet Sharing

I have a MacBook Pro and a iMac. On the MacBook I see a network interface named "iPhone USB" in my Network Settings. On the MacBook the internet sharing over usb works fine. But on the iMac it doesn't work. On the iMac there is no "iPhone USB" interface and it doesn't appear a "New network device detected" window if I connect the iPhone to the iMac via USB. How can I add the "iPhone USB" network interface?

Please help.

Software Versions:
iMac 10.7.3
MacBook Pro 10.7.2
iPhone 5.0.1

Solution 1:

Try checking out the iPhone: Trouble Shooting Personal Hotspot article. Specficially the USB Trouble Shooting information.

If you are using USB to connect your computer to Personal Hotspot and you are unable to get an Internet connection, check your computer's network settings. You may need to adjust your computer's network settings to disconnect and reconnect the USB Ethernet interface.

Open System Preferences > Network. Locate and select the Ethernet adapter listed, and then click the gear icon and choose Make Service Inactive. Then choose Make Service Active:

Solution 2:

Try this:

• Turn off tethering on your iPhone
• Plug iPhone into iMac
• Turn tethering back on