Error 9812 appears when we try to access the iTunes store with iTunes. Following error message appears on computer screen. "iTunes could not connect to the iTunes Store. An unknown error occurred (-9812). Make sure your network connection is active and try again." Here are some tips to fix error 9812 instantly:

Install Latest Version of iTunes
Error 9812 in Windows 7, Vista and XP may appear on screen if you have an outdated version of iTunes installed on your computer. This problem can be resolved by installing the latest version. Uninstall the old version properly before installing latest version to avoid conflicts. Follow these steps:
a.iTunes
b.QuickTime
c.Bonjour
Restart your PC on completion of process
Install Microsoft Update KB931125
Windows Error 9812 may also appears if the KB931125 update is missing from you system. Follow the steps below to install this update:
Fix Broken Registry Entries of iTunes
Broken registry entries of iTunes may also results in error 9812. In this case you need to repair Windows registry to get rid of the problem. You can repair it manually if you have expert computer skills otherwise download and install a System Utilities program that includes a Registry Repairing tool. This tool automatically scans and fixes all the errors in the registry.