The reason for the error 3194 is an error in the communication between the computer and the Apple's servers. The most common culprits for this error message are:
The solutions listed above should help you fix this issue, provided that you follow them carefully.
If you tried everytning else to fix the issue, but nothing worked, take your device to a repair shop and they should be able to resolve the problem.
Note: Take your device to an authorised repair shop only, to ensure that you will receive the best service.
If none of the other solutions worked and the error 3194 persists, try to restore or update your device on another computer, with a different Internet connection.
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