Keychain is OS X’s database of passwords and keys used when retrieving email, connecting to Mobile Me (Formally .Mac), or anything that contains auto sign-on. We take the Keychain for granted and usually don’t even know of it’s existence. However, there’s one error that people keep asking me about: Error -2147415734. Keychain Error’s can be a huge pain, however this entry will explain how to fix the problem in a few simple steps.

1. Locate the Keychain Utility in your Applications directory under Utilities.
2. Launch Keychain Utility.
3. Look for the fields whose Kind is “.Mac Password.” (Unless you have changed the default Keychain configuration, it/they will be located under the “login” keychain).
4. Select and remove the fields by pressing the delete key on your keyboard.
5. Confirm the deletion.
6. Close Keychain Utility.

You will have to re-enter these passwords next time they need to be used (checking email, syncing to Mobile Me, etc.) and they will be “re-stored” in the Keychain.

Note: You may need to click the lock icon (in the upper left on OS X 10.5 “Leopard”) in order to make changes to your Keychain by authenticating yourself.

Huzzah! Problem solved!