Q: unknown error occured (11556)

"Error 11556"

This alert occurs when iTunes is trying to do something not allowed by the iTunes Store in that country.

The most common example of this is trying to sign in while limited to iTunes U by Parental Controls.

For more information, see the steps from iTunes 9: "One Moment Please" or "Error (-50)" message when accessing iTunes Store.

Also,

Have you looked at the previous discussions listed on the right side of this page under the heading "More Like This"? Ones with a green checkmark are solved.

IIIaass is right on the money! Specifically, please go to this page for error 11556 (in most cases, this should solve the error 11556): http://support.apple.com/kb/TS3288

It's that (I found this myself yesterday, after weeks of helplessness in solving the error 11556) whenever iTunes is updated, the Parental Controls in iTunes are, by default, set to 'enabled' mode! One needs to disable/unckeck this on the iTunes menu (under 'Edit' -->  'Preferences' -->  'Parental'). See the relevant discussion/thread here:https://discussions.apple.com/message/22473554#22473554

Regards.

Request the moderator to remove/delete the last sentence in my reply post above (as I posted that sentence by mistake in my reply), i.e., "See the relevant discussion/thread here:https://discussions.apple.com/message/22473554#22473554 "

and replace/substitute the deleted sentence with the foll.:

See the relevant discussion/thread here: https://discussions.apple.com/message/16957408#16957408