How To Fix iTunes Error–9812 On Windows And Mac ~ Gadgets online

Some users have experienced iTunes error –9812 while trying to access the iTunes Store."iTunes could not connect to the iTunes Store. An unknown error occurred (-9812). Make sure your network connection is active and try again." This is the error message. Well, Here is how to fix that.

How To Fix iTunes Error –9812 [Mac]

If you have broadband access (cable, DSL, or other high-speed access), try turning your modem off for a minute and then turning it back on. If you also have a router connected to the modem, turn it off for a minute and then back on again. Once you've established a web connection, try accessing the iTunes Store again from iTunes.
To create a test new user:
From the Apple menu, choose System Preferences.
From the View menu, choose Accounts.
Click "+".
Give the new user a name and short name.
Select the checkbox for "Allow user to administer this computer". This makes the user account an administrator.
Click OK, or quit System Preferences.
If resolved in the new user, the issue may be with VeriSign certificates in your login keychain under the main user.
Quit all open programs.
In the Finder, from the Go menu, choose Utilities.
Open Keychain Access.
Highlight the login keychain. If unable to find the login keychain, click the button in the lower left corner to show keychains.
Under Category, choose Certificates.
Look for an entry with a name beginning with VeriSign.
Highlight all entries which match that description.
From the File menu, choose Export Items....
After exporting the entries, from the Edit menu, choose Delete.
Choose 'Delete' if asked.
Restart.

How To Fix iTunes Error –9812 [Windows]

If you have broadband access (cable, DSL, or other high-speed access), try turning your modem off for a minute and then turning it back on. If you also have a router connected to the modem, turn it off for a minute and then back on again. Once you've established a web connection, try accessing the iTunes Store again from iTunes.
Check for updates to Windows, or search Microsoft's support pages for KB931125. An update may be available, such as Update for Root Certificates [May 2010] (KB931125). Install the latest available update for root certificates from Microsoft.

[Via]