iTunes 4.8: Error 400 in the iTunes Store

If you encounter an Error 400 message while visiting the iTunes Store on a Mac with iTunes 4.8, update to iTunes 4.9 or later to resolve the issue.

If for some reason you are unable to upgrade immediately, you can use these steps to resolve the issue:

1. Quit iTunes.
2. Open Safari.
3. From the Safari menu, choose Preferences.
4. Click the Security icon in the top row.
5. Click the Show Cookies button.

   

6. In the resulting dialog, scroll down the list of cookies until you see the ".apple.com" cookies.
7. In the Name column, select all the apple.com cookies that start with "s_vi_" and then click Remove.

   

8. Click Done.
9. Open iTunes and connect to the iTunes Store.