HT4623 i tunes wont sync or backup i phone 4s because a connection error

my i phone 4s wont sync or bakup via usb because it says there has been a connection error .i never had this problem before ,my music and apps tranfer but new phone contacts dont any help,

Hey Kevin,
When troubleshooting connection error messages, I find the following article provides the best help:
iOS: Troubleshooting USB connection
http://support.apple.com/kb/TS1286
Thanks,
Matt M.

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