
You can also use the keyboard shortcut Cmd + Comma to open the Preferences window. To reset your keychains, open the Keychain Access app and select Preferences from the Keychain Access menu. This is far from ideal, but a reset is the only way to get your keychains useable again and, with a clean slate, you can set the stage for better password management going forward. A reset will delete all the login and financial information your keychains store. In the resulting Change Keychain Password window:Enter the current password (If doing this for the first time, the password is the administrator password).Enter.

In the case of lost or corrupted login or Local Items passwords, you’ll definitely need to reset your keychains.

Otherwise, your only recourse is to reset all of your keychains entirely. With forgotten, non-default keychain passwords, you may need to just delete the keychain and start over.

Also, if something goes wrong with your Mac or your use account passwords, the login or Local Items keychain passwords could be lost as well, or they could revert to a previous user password. What do you do if you forget a keychain password? That’s difficult to do with the default keychains that use your user account password, but it’s quite possible with keychains you’ve created. How to Recover or Reset a Keychain Password
