iTunes for Mac reports error -50 when trying to authorize iTunes Store purchases

After installing the Mac OS X 10.4.9 Update, iTunes may be unable to properly authorize your computer to play your iTunes Store purchases.

This article has been archived and is no longer updated by Apple.

The following steps will delete your network preferences. Most broadband connections do not require any special settings to connect, but if your connection does or if you are not sure, please contact your ISP or network administrator for further assistance.

Important: You must be logged in as an Administrator.

  1. Click the Finder icon in the Dock.
  2. Choose Go to Folder from the Go menu.

  3. Type /Library/Preferences/SystemConfiguration

  4. Click Go.
  5. In the Finder window, locate the file named NetworkInterfaces.plist.

  6. Drag this file to the Trash.
  7. Restart the computer.

Once your computer has restarted. You will not be able to connect to the Internet. Now you will need to refresh your network settings to be able to connect again.

  1. Choose System Preferences from the Apple menu.

  2. Choose Network from the View menu.
  3. To refresh your network settings, from the Location pop-up menu, choose New Location.

  4. Type a name for your location and click OK.

  5. Click the Apply Now at the bottom right to accept the changes.

If your network connection requires any special settings, you will need to put them back in at this point. Once you have made these changes you should be able to connect to the Internet again and authorize your computer to play your iTunes Store purchases.

Learn more about how a missing folder or incorrect permissions may prevent authorization.

Last Modified:

Additional Product Support Information

Start a Discussion

in Apple Support Communities
See all questions on this article See all questions I have asked
United States (English)