How to fix error 3194 when updating your iphone or ipad

When you are attempting to update, restore or downgrade iPhone, iPad, iPod touch or iPod shuffle iOS on Windows or Mac, the iTunes error 3194 message may appear similar to the following:

The iPhone "iPhone" could not be restored. An unknown error occurred (3194).

before doing steps given bellow pls check if you are updateing your device to latest version or not because this error caused when you are not updateing your device to a latest ios to check and download the latest veriosn of ios for your device click here and if then also you are geting the problem then follow this steps

1. Close the iTunes.
2. Locate the hots file:
   • in Mac OS X, it is /etc/hosts
   • in Windows, it is c:\windows\system32\drivers\etc\hosts
3. Open the hosts file with Notepad.
4. With Administrator privileges, at the bottom of the Notepad, type the following line:
   • 74.208.105.171 gs.apple.com
5. Connect iPhone to computer.
6. Run the iTunes.
7. Turn off iPhone/iPad/iPod and hold down the sleep and power button for 10 seconds.
8. Release the power button but hold onto the home button until the iTunes displays the device is in recover mode.
9. Use iTunes Restore feature with the iOS device as usual.
10. After iOS have been updated, delete the "74.208.105.171 gs.apple.com" line from the hosts file, and then the iTunes can correctly update again.