problem with update of apps - ann unknown error occurred 11503

Almost daily when I try to update my IOS apps in iTunes I get error - ' could purchase < app > an unknown error has occurred. There was an error in the iTunes store' with error 11503. This is the case most of the time but not all the time. If I try again later, I am sometimes able to update applications. I check the status of the iTunes store and it shows no problem. I log out and back in iTunes (last verse.) and it does not help. The solution is to make the app on the device (iPhone, with the latest IOS) updates. There's other light this or you will suggest fix?

I know with iOS9 that apple went to a more direct service provider device app store. The main difference was you could are no longer synchronized apps from a device to iTunes, but you could still make it on the other hand, as well as download on iTunes. With "thinning" each device has received a version customized for a specific application for the model of the device but if you downloaded iTunes no thinning version was as long as it works on any iOS hardware. It is in itself would not explain your experience, but I wonder if it is somehow connected and perhaps it is not a version not cleared up (wild guess)?

Tags: iTunes

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