Fix MySQL Authentication Failed Error - mysql_native

Error Message: "Authentication to host for user using method 'mysql_native_password' failed"

As a programmer, encountering this error means there's an issue with how MySQL authentication is being handled. This usually happens when the MySQL user authentication method is mismatched or incorrectly configured. Here's how I solve it step by step.

This error commonly appears with MySQL 8.0+ when clients expect the older mysql_native_password method but the server uses caching_sha2_password.

Check the MySQL Authentication Plugin

This error often happens because MySQL switched to caching_sha2_password as the default authentication method in MySQL 8.0, while older clients and some connectors still expect mysql_native_password.

To check what authentication method your user is using, I run:

SELECT user, host, plugin FROM mysql.user WHERE user = 'myuser';

If the output shows something like this:

+--------+-----------+-----------------------+
| user   | host      | plugin                |
+--------+-----------+-----------------------+
| myuser | localhost | caching_sha2_password |
+--------+-----------+-----------------------+

Then MySQL is using caching_sha2_password, which may not be supported by my client.

Switch to mysql_native_password

If my client requires mysql_native_password, I change it by running:

ALTER USER 'myuser'@'localhost' IDENTIFIED WITH mysql_native_password BY 'mypassword';
FLUSH PRIVILEGES;

Then I restart the MySQL server to apply changes:

Linux:
sudo systemctl restart mysql
Windows:
net stop mysql
net start mysql

Update MySQL Connector or Client

If I don't want to change the authentication method, I update my MySQL client or connector to the latest version so it supports caching_sha2_password:

For Node.js (mysql2): npm install mysql2@latest
For Python (MySQL Connector): pip install --upgrade mysql-connector-python
For C# (MySql.Data):
Install-Package MySql.Data -Version 8.0.33
For PHP (MySQLi/PDO):
sudo apt update && sudo apt install php-mysql

Grant Remote Access (If Needed)

If I'm trying to connect from another machine and get this error, I allow MySQL remote access:

GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;
FLUSH PRIVILEGES;

I also ensure bind-address is configured correctly in my.cnf:

bind-address = 0.0.0.0

Then restart MySQL.

Verify Connection String

Sometimes, the error is just a bad connection string. I check that I'm using the right parameters.

Node.js (mysql2)

const mysql = require('mysql2');
const connection = mysql.createConnection({
  host: 'localhost',
  user: 'myuser',
  password: 'mypassword',
  database: 'mydb',
  authPlugins: { mysql_native_password: () => () => Buffer.from('mypassword') }
});

Python (MySQL Connector)

import mysql.connector
conn = mysql.connector.connect(
    host="localhost",
    user="myuser",
    password="mypassword",
    database="mydb",
    auth_plugin="mysql_native_password"
)

C# (MySql.Data)

string connStr = "Server=localhost;Database=mydb;User ID=myuser;Password=mypassword;";
using (var connection = new MySqlConnection(connStr))
{
    connection.Open();
}

Final Thoughts

If I get "Authentication to host for user using method 'mysql_native_password' failed", I check:

The current authentication method (mysql_native_password or caching_sha2_password).
Whether I need to switch to mysql_native_password.
If my MySQL client/connector is outdated.
Whether remote access is allowed (if connecting from another machine).
If my connection string is correct.

With these steps, I always get MySQL authentication working.

Fixing "Authentication to host for user using method 'mysql_native_password' failed"

Check the MySQL Authentication Plugin

Switch to mysql_native_password

Update MySQL Connector or Client

Grant Remote Access (If Needed)

Verify Connection String

Node.js (mysql2)

Python (MySQL Connector)

C# (MySql.Data)

Final Thoughts

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Fixing "Authentication to host for user using method 'mysql_native_password' failed"

Check the MySQL Authentication Plugin

Switch to mysql_native_password

Update MySQL Connector or Client

Grant Remote Access (If Needed)

Verify Connection String

Node.js (mysql2)

Python (MySQL Connector)

C# (MySql.Data)

Final Thoughts

High-Availability Cloud VDS

Hosting

Cloud Solution

For You

VDS

Website Builders

Our services

Client Area

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