my i phone is asking me to connect it to itunes but a message appear with error 17

See: Get help with iOS update and restore errors - Apple Support

This error can also mean that you are trying to install a version of iOS that the phone does not support (such as a version older than the current version for your device), or that your device is jailbroken.

Solve network errors

Errors: 17, 1638, 3014, 3194, 3000, 3002, 3004, 3013, 3014, 3015, 3194, 3200. You might also see these alert messages:

• "There was a problem downloading the software."
• "The device isn't eligible for the requested build."

These alerts mean that your computer is either having difficulty contacting the Apple update server or communicating with your device.

Check your computer for software or settings that might cause communication issues between your computer and Apple or between your computer and your device.

If you still see the error message, check your security software.