2

Check whether the itunes account is authorized for this computer. If not, please follow the following steps to authorize.

1) In the top menu bar of itunes, find "store" and select "Authorize this computer" in the drop-down menu box.

2) Enter the Itunes account and password to authorize the computer.

three

In the top menu bar of itunes, find "Edit" and select "Preferences" in the drop-down menu box.

In the pop-up window, find "Parents", then check "Disable -itunes store" and "Allow itunes U", and then click OK.

Clicking itunes Store in iTunes will automatically jump to itunes U, because of our settings.

four

Select your ipad and click Sync to sync it once.

five

In the top menu bar of itunes, find "Edit" and select "Preferences" in the drop-down menu box.

In the pop-up window, find "Parents", then uncheck "Disable -itunes store", and then click OK.

six

After forced synchronization, you can open the app store smoothly on the ipad.

end

Other available methods:

Refresh firmware

Uninstall itunes completely, and then reinstall the latest version of itunes.

three

Network problem, reset the network. Especially wireless networks.

four

Unsolvable problem: the Apple server is temporarily unable to connect. (accident)