Mac Keychain Errors — Password Prompts, Locked Keychain, and Repair Guide

Fix macOS Keychain errors including repeated password prompts, locked keychain, Keychain Access repair, and iCloud Keychain sync failures. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Keychain Access stores passwords, certificates, encryption keys, and secure notes. The login keychain should automatically unlock when you log in to your Mac. If the login keychain password differs from your user password, macOS prompts repeatedly. iCloud Keychain syncs passwords across Apple devices via end-to-end encryption. Keychain First Aid (removed in newer macOS) was replaced by the Keychain Access > Preferences repair. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Login keychain password out of sync with macOS user account password. Keychain database corrupted preventing automatic unlock at login. iCloud Keychain sync conflict between devices. Password changed on another device without updating the keychain. Migration from another Mac bringing a keychain with a different password. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Update keychain password: Keychain Access > right-click 'login' keychain > Change Password for Keychain. Repair keychain: Keychain Access > Keychain Access menu > Keychain First Aid (older macOS) or verify/repair. Reset login keychain: Keychain Access > Preferences > Reset My Default Keychains (loses saved passwords). Create a new keychain: Keychain Access > File > New Keychain, then set it as default. Fix iCloud Keychain: System Settings > Apple ID > iCloud > toggle Keychain off and on. If all else fails: delete ~/Library/Keychains/login.keychain-db and restart (creates a new empty keychain). If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Mac Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.