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Guti_Haz
Guti_Haz

Reputation: 2708

php mysqli_connect: authentication method unknown to the client [caching_sha2_password]

I am using php mysqli_connect for login to a MySQL database (all on localhost)

<?php
//DEFINE ('DB_USER', 'user2');
//DEFINE ('DB_PASSWORD', 'pass2');
DEFINE ('DB_USER', 'user1');
DEFINE ('DB_PASSWORD', 'pass1');
DEFINE ('DB_HOST', '127.0.0.1');
DEFINE ('DB_NAME', 'dbname');

$dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

if(!$dbc){
    die('error connecting to database');    
}
?>

this is the mysql.user table: mysql.user table

MySQL Server ini File:

[mysqld]
# The default authentication plugin to be used when connecting to the server
default_authentication_plugin=caching_sha2_password
#default_authentication_plugin=mysql_native_password

with caching_sha2_password in the MySQL Server ini file, it's not possible at all to login with user1 or user2;

error: mysqli_connect(): The server requested authentication method unknown to the client [caching_sha2_password] in...

with mysql_native_password in the MySQL Server ini file, it's possible to login with user1, but with user2, same error;

how can I login using caching_sha2_password on the mySql Server?

Upvotes: 171

Views: 342195

Answers (20)

shanecp
shanecp

Reputation: 851

For mysql 8.4, this suggested line doesn't work anymore,

[mysqld]
default-authentication-plugin=mysql_native_password

Instead, you should use,

[mysqld]
mysql_native_password=ON
  • Then restart mysql service.
  • Update the user's authentication method
mysql -u root -p

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';

Upvotes: 0

Lenin Sheikh
Lenin Sheikh

Reputation: 341

I have the similar issue. Before solving it lets first understand the problem.

MySQL 5.7 and earlier: These versions use mysql_native_password as the default authentication plugin. This plugin uses a simple password hashing algorithm and is widely supported by various MySQL client libraries, including older PHP versions.

MySQL 8.x: The default authentication plugin is caching_sha2_password, which provides better security through the SHA-256 hashing algorithm. This newer authentication method was not initially supported by all MySQL client libraries, including older versions of PHP's MySQL extensions (like mysqli and PDO).

PHP 7.2 and earlier: These versions were released before or around the time MySQL 8.0 was released. As such, the default MySQL extensions in these PHP versions may not support caching_sha2_password out of the box.

PHP 7.4 and later: These versions have improved support for MySQL 8.x and its default caching_sha2_password authentication plugin. Thus, they can connect to MySQL 8.x databases using the new authentication method without requiring configuration changes.

So the problem is when you are using latest MySQL (v8.+) with old PHP ( 7.3.x and earlier) that does not have support for caching_sha2_password you might get similar issue.

to solve this issue you need change mysql default authentication plugin from caching_sha2_password to mysql_native_password

Update my.cnf then restart Mysql

[mysqld]
default_authentication_plugin= mysql_native_password

Login into mysql as root using terminal then run these

- when your mysql host is 'localhost'

ALTER USER 'dbuser'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root@123';

- when your mysql host is other than 'localhost', like 10.10.0.2 etc.

ALTER USER 'dbuser'@'%' IDENTIFIED WITH mysql_native_password BY 'root@123';

[Note] make sure you replace dbuser with your actual database username.

- finally flush all privilege

FLUSH PRIVILEGES;

Upvotes: 3

Ryan Arief
Ryan Arief

Reputation: 1035

In my case:

I'm using PHP 5.6 and MYSQL 8. Since MYSQL 8 comes with caching_sha2_password as default authentication and PHP 5.6 doesn't support it yet, i have to set MYSQL 8 authentication to mysql_native_password by doing:

add

default-authentication-plugin=mysql_native_password

to the end of line of /etc/mysql/conf.d/mysql.cnf configuration file in ubuntu 22.04

Upvotes: 0

Usama Munir
Usama Munir

Reputation: 635

In Digital Ocean Managed Mysql, we have an option to change encryption, you can change to legacy and it'll work ok.

Upvotes: 0

MiraTech
MiraTech

Reputation: 1302

If you have not yet already changed your MySQL default authentication plugin, you can do so by:

  1. Log in as root to MySQL
  2. Run the following SQL command:

a. if you are running MySQL in a different server:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password
BY 'password';

b. if you are running MySQL in a different server:

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password
BY 'password';

Upvotes: 1

sh6210
sh6210

Reputation: 4530

In my case, i'm using PHP Symfony framework and it's a silly mistake.

The database credential was wrong in paramers.yml.

After changing the credentials accordingly the problem was gone.

Upvotes: 0

MAChitgarha
MAChitgarha

Reputation: 4288

phpMyAdmin GUI way

Note: This method may not work if you have the problem with root user account.

  1. Login to phpMyAdmin as root.
  2. Switch to "User Accounts" tab.
  3. Select the username you get error with.
  4. From the top buttons, switch to "Login Information" section.
  5. In "Login Information" box, change "Authentication plugin" from "Caching sha2 authentication" to "Native MySQL authentication". Also, you must fill in other required fields, obviously, including username and password.
  6. Save it by clicking on the "Go" button at the bottom.
  7. Return back to terminal and enjoy. :)

Upvotes: 0

Harsh
Harsh

Reputation: 143

In my case when I was using WAMP server I fixed it using following

  1. Note the port in mySQL's "my.ini" file. In my case it was changed to 3308 when I was switching b/w MariaDB and MySQL DB.

enter image description here

  1. Use the port number when you create mysqli object.

enter image description here

Using the above steps I was able to run the program successfully.

Upvotes: 0

Zeeshan Mehdi
Zeeshan Mehdi

Reputation: 1439

I am using laravel 5.8 and having MAMP server got this error resolved by adding DB_SOCKET=/Applications/MAMP/tmp/mysql/mysql.sock in .env file like below

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=8889
DB_DATABASE=dbname
DB_USERNAME=root
DB_PASSWORD=root
DB_SOCKET=/Applications/MAMP/tmp/mysql/mysql.sock

Upvotes: 0

abeyaz
abeyaz

Reputation: 3164

As of PHP 7.4, this is no longer an issue. Support for caching_sha2 authentication method has been added to mysqlnd.

Currently, PHP mysqli extension do not support new caching_sha2 authentication feature. You have to wait until they release an update.

Check related post from MySQL developers: https://mysqlserverteam.com/upgrading-to-mysql-8-0-default-authentication-plugin-considerations/

They didn't mention PDO, maybe you should try to connect with PDO.

Upvotes: 105

Pavel Niedoba
Pavel Niedoba

Reputation: 1557

Now you can upgrade to PHP7.4 and MySQL will go with caching_sha2_password by default, so default MySQL installation will work with mysqli_connect No configuration required.

Upvotes: 5

dBags
dBags

Reputation: 507

Like many many people, I have had the same problem. Although the user is set to use mysql_native_password, and I can connect from the command line, the only way I could get mysqli() to connect is to add

default-authentication-plugin=mysql_native_password

to the [mysqld] section of, in my setup on ubuntu 19.10, /etc/mysql/mysql.conf.d/mysqld.cnf

Upvotes: 36

kp123
kp123

Reputation: 1330

If you're on a Mac, here's how to fix it. This is after tons of trial and error. Hope this helps others..

Debugging:

$mysql --verbose --help | grep my.cnf

$ which mysql
/usr/local/bin/mysql

Resolution: nano /usr/local/etc/my.cnf

Add: default-authentication-plugin=mysql_native_password

-------
# Default Homebrew MySQL server config
[mysqld]
# Only allow connections from localhost
bind-address = 127.0.0.1
default-authentication-plugin=mysql_native_password
------

Finally Run: brew services restart mysql

Upvotes: 8

Steven Canales
Steven Canales

Reputation: 3

I think it is not useful to configure the mysql server without caching_sha2_password encryption, we have to find a way to publish, send or obtain secure information through the network. As you see in the code below I dont use variable $db_name, and Im using a user in mysql server with standar configuration password. Just create a Standar user password and config all privilages. it works, but how i said without segurity.

<?php
$db_name="db";
$mysql_username="root";
$mysql_password="****";
$server_name="localhost";
$conn=mysqli_connect($server_name,$mysql_username,$mysql_password);

if ($conn) {
    echo "connetion success";
}
else{
    echo mysqli_error($conn);
}

?>

Upvotes: -4

imjesr
imjesr

Reputation: 119

I tried this in Ubuntu 18.04 and is the only solution that worked for me:

ALTER USER my_user@'%' IDENTIFIED WITH mysql_native_password BY 'password';

Upvotes: 4

CJ Dennis
CJ Dennis

Reputation: 4336

If you're on Windows and it's not possible to use caching_sha2_password at all, you can do the following:

  1. rerun the MySQL Installer
  2. select "Reconfigure" next to MySQL Server (the top item)
  3. click "Next" until you get to "Authentication Method"
  4. change "Use Strong Password Encryption for Authentication (RECOMMENDED)" to "Use Legacy Authentication Method (Retain MySQL 5.X Compatibility)
  5. click "Next"
  6. enter your Root Account Password in Accounts and Roles, and click "Check"
  7. click "Next"
  8. keep clicking "Next" until you get to "Apply Configuration"
  9. click "Execute"

The Installer will make all the configuration changes needed for you.

Upvotes: 32

Eranda J.
Eranda J.

Reputation: 529

ALTER USER 'mysqlUsername'@'localhost' IDENTIFIED WITH mysql_native_password BY 'mysqlUsernamePassword';

Remove quotes (') after ALTER USER and keep quote (') after mysql_native_password BY

It is working for me also.

Upvotes: 45

Chinnon Santos
Chinnon Santos

Reputation: 455

It's working for me (PHP 5.6 + PDO / MySQL Server 8.0 / Windows 7 64bits)

Edit the file C:\ProgramData\MySQL\MySQL Server 8.0\my.ini: 

default_authentication_plugin=mysql_native_password

Reset MySQL service on Windows, and in the MySQL Shell...

ALTER USER my_user@'%' IDENTIFIED WITH mysql_native_password BY 'password';

Upvotes: 22

JRonald Moreno
JRonald Moreno

Reputation: 99

I ran the following command ALTER USER 'root' @ 'localhost' identified with mysql_native_password BY 'root123'; in the command line and finally restart MySQL in local services.

Upvotes: 9

黃皓哲
黃皓哲

Reputation: 3640

I solve this by SQL command:

ALTER USER 'mysqlUsername'@'localhost' IDENTIFIED WITH mysql_native_password BY 'mysqlUsernamePassword';

which is referenced by https://dev.mysql.com/doc/refman/8.0/en/alter-user.html

if you are creating new user 

 CREATE USER 'jeffrey'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

which is referenced by https://dev.mysql.com/doc/refman/8.0/en/create-user.html

this works for me

Upvotes: 343

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