Database auth/default
MySQL 8.4 mysql_native_password disabled by default authentication plugin error official documentation
An older connector/user receives authentication plugin errors after server upgrade.
Agent Quick Fix
Repair against the current MySQL 8.4 contract, then keep the change narrow and source-backed.
Product: MySQL 8.4
Current-contract area: mysql_native_password disabled by default
Likely root cause: An older connector/user receives authentication plugin errors after server upgrade.
Repair direction: Verifier checks a supported authentication path without globally weakening the server. Check operational state and security, not a compatibility switch that weakens the server.Symptom
An older connector/user receives authentication plugin errors after server upgrade.
Why This Happens
Client credentials and code are unchanged; the database server's current plugin/default configuration determines whether authentication succeeds.
Common Wrong Fixes
- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.
Codex Search Keywords
These are the search terms observed in a neutral Codex validation run for this failure shape.
MySQL 8.4 mysql_native_password disabled by default authentication plugin error official documentation
site:dev.mysql.com/doc MySQL 8.4 mysql_native_password disabled by default
https://dev.mysql.com/doc/refman/8.4/en/native-pluggable-authentication.html