I've been searching the site and haven't found a solution to this problem. Problem started with me using Yosemite and iTunes beta and the iPhone would cause iTunes to crash. Installed Xcode and everything seemed to work fine until I tried installing the GM again. I received the "error 17" code. I used Tiny Umbrella to get my phone out of the restore process. Here's the solution to get rid of the error 17 on a mac. 1. Go to terminal and type in "sudo nano /private/etc/hosts" 2. Type in password 3. Once it's loaded use the arrow key to go to the very bottom and delete the entire "*.apple.com" entry 4. When finished, hit Control+O followed by "enter" to save changes, then hit Control+X to exit Then you're done! This worked for me. Do this at your risk. It may or may not work for everyone.