My iCloud is not syncing between my mac and my iPhone and shows the following error message CoreDAVHTTPStatusErrorDomain error 501. what does this mean?!

I have recently upgraded to an iphone 5S 4G and also updated my mac with the latest software so that i can use the icloud to back up all my stuff. It doesn't seem to be working with my contacts at all and recently added ones are disappearing, old ones are duplicating etc. The contacts icloud has the following error message CoreDAVHTTPStatusErrorDomain error 501. and I have no idea what it means. Can anyone help?

I had this problem before. I like to disable extra services to speed up my computer and I disabled the Apple Mobile Device service and had to re-enable this.
You can do that by going Control Panel>Administrative Tools>Services. Once you have gone to the services window, look for Apple Mobile Device and right-click. Select "Properties". There should be some information about the service as well as the label "Startup Type" with a drop-down menu beside it. If it says "disabled", that is your problem; Change the selection to anything except disabled (Automatic is easier and ensures that you can sync as soon as itunes opens).
If this doesn't work, I would look into your anti-virus' settings. Good Luck!

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