ipad connection itunes9815 error solution and unknown errors -9800 and -9814:

Performance of the problem:

For best performance, please Make sure your computer's date and time are set correctly when using iTunes.

　1. Products purchased from the iTunes Store do not work properly

　2. When trying to connect to the iTunes Store, a warning containing a -9800, -9815, or -9814 error may be displayed.

Solution:

1. Exit iTunes.

2. Set the correct date on your computer. If you need help performing this operation, check your computer's built-in help system.