400 error, cannot connect to iTunes Store - and can not find S.o.s. keychain

I don't know when the problem started. Possibly with El Capitan. The iTunes Store shows a pageful of proposed music, but any attempt actually nothing to do with the store evokes:

We could not complete your iTunes Store request. An unknown error occurred (400).

There was an error in the iTunes Store. Please try again later.

I use the document troubleshooting Apple, If you can not connect to the iTunes Store - Apple Support

I can access Internet, I meet the iTunes system requirements and my operating system is up-to-date (10.11.3).

I downloaded and reinstalled iTunes. Version has been 1.3.2.35 before and after installation.

The problem is the specific user account. I can reach the iTunes store from another account, a 'clean' relatively unused, but not from 'my' main account. This shows that the problem is not anything with any external network for Mac equipment.

The next step is to try s.o.s. Keychain, and I am puzzled. Links to an obsolete page that is inaccurate, and I'm darn if I can find it. I guess I'm supposed to be using the Keychain Access application, which I use almost never, and I can't find S.o.s. keychain. "First" by typing in the box help does not work.

Hi Daniel,.

I see that your Mac is unable to process any request of iTunes Store, giving you an unknown error (400).   Given the very good troubleshooting you have already made, I suggest that you follow the steps in the article to support link below.

Advanced steps for fixing problems with the iTunes Store connection

Take care.

Tags: iTunes

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