I had this problem too.
I am running iTunes on an old PowerPC MacMini using iTunes 10.6.3. I was trying to stream video on my iPad mini and kept getting the error: "You do not have permission to access the requested resource".
So, I turned on iTunes on my laptop which is using Mavericks and the latest version of iTunes. It worked fine off it. It's just sometimes I like to keep my laptop in its bag and run things off my iPad through my MacMini.
So, I did follow the reset network settings on my iPad. It fixed it temporarily. In the middle of an episode of BBT the error message came up again.
I tried starting iTunes again. I reboot the machine. Still got the error.
So, I ran Onyx on the MacMini. There were a lot of permission errors on the hard drive. Once I fixed those, it seems I now have permission to access that resource.
If you have a disk utility, try running it on your source computer to fix any disk permissions or errors that may be causing the error.
In my case, it was the disk permissions needed repair.