Cannot authorize apps to be synced to itouch

i have an itouch 4 and the other day i tried to sync my itouch with itunes and most of my apps were deleted from my itouch, only a few are left. i keep trying to sync them again, but it says that my computer is no longer authorized for apps installed in my itouch. So i authorize it and an error message pops up every time: we could not complete your itunes store request. an unown error occurred (-42003).

I had the same issue, that is now solved without losing anything. I don't know what fixed it, but I'll tell you everything I did.
- I remembered 5 computers were authorized for my account, which is the max. I went into my account and deauthorized all the them. It didn't solve it.
- I signed of, signed in again, it didn't solve it.
- I went to my other computer, authorized it, and didn't get the error. So I thought it was on my main computer that there was an issue. So I was thinking of reinstalling iTunes, but instead,
- I disconnected my iPod from the USB port
- I rebooted my computer
- I authorized it, THE ERROR WAS GONE
- I connected my iPod and synced it.
Could you guys try? I'm curious to know if it will solve your issues too. I repeat that I don't know what solved it. It might be the reboot, it might be that the iPod wasn't connected on the USB, it might be that I rebooted my computer, that I reauthorized an other before the one that has the issue, ... ?

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