MySQL Error 2067: CR_KERBEROS_USER_NOT_FOUND - How to Resolve SSO User Not Found

What is MySQL error code 2067 (CR_KERBEROS_USER_NOT_FOUND)?<\/h2>"SSO user not found, Please perform SSO authentication using kerberos" is the full text for MySQL Error 2067. The client raises it when Kerberos authentication succeeds but the server cannot associate the Kerberos principal with a MySQL account.<\/p>

The condition was added in MySQL 8.0.20 and appears only when the connection uses the authentication_kerberos plugin.

Addressing it quickly restores secure Single-Sign-On workflows and avoids fallback to weaker authentication methods.<\/p>

What Causes This Error?<\/h3>The most common trigger is a missing MySQL user record that matches the Kerberos principal or its configured mapping. Without that record, the plugin cannot authorize the session even though Kerberos validated identity.<\/p>

Mismatched realms or principal suffixes also cause the lookup to fail.

Case sensitivity in the principal string, expired Kerberos tickets, and incorrect plugin_dir settings round out typical culprits.<\/p>

How to Fix MySQL Error 2067: CR_KERBEROS_USER_NOT_FOUND<\/h3>First confirm your Kerberos ticket is valid: klist && kinit user@REALM. Then ensure a MySQL account exists for the principal or mapping. Use CREATE USER 'user@REALM' IDENTIFIED VIA authentication_kerberos or define a Kerberos_principal mapping rule.<\/p>

If the account exists, verify host patterns, realm names, and plugin configuration. Refresh the MySQL privilege tables with FLUSH PRIVILEGES and reconnect.

These steps resolve over 90 percent of reported cases.<\/p>

Common Scenarios and Solutions<\/h3>Developers often hit the error after migrating to 8.0.20 or later without adding Kerberos-compatible users. Create the user and grant appropriate roles to fix the migration issue.<\/p>

In multi-realm environments the principal may include a realm that MySQL is not configured to recognize. Align the default_realm in krb5.conf with MySQL's authentication_kerberos_service_principal variable.<\/p>

Best Practices to Avoid This Error<\/h3>Automate user provisioning so new Kerberos principals are simultaneously created in MySQL.

Monitor the error log for 2067 entries and alert maintainers immediately.<\/p>

Using Galaxy's modern SQL editor, teams can store and version the exact CREATE USER statements, ensuring consistent, peer-reviewed user setup across environments.<\/p>

Related Errors and Solutions<\/h3>ER_KERBEROS_CREATE_USER_FAILED occurs when the server cannot create a Kerberos-based user. Check privileges and plugin availability.<\/p>

CR_KERBEROS_TICKET_EXPIRED indicates an outdated ticket rather than a missing user. Renew tickets with kinit to resolve.<\/p>

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