Fix MySqlException 0x80004005 by Updating MySQL Connector

As a server administrator, if I receive a report about MySqlException (0x80004005) and it's related to an outdated MySQL connector or client, my first step is to verify, diagnose, and update the necessary components. Here's how I handle it step by step.

This guide focuses on connector/client updates. Always test updates in a development environment before applying to production.

Identify the Installed MySQL Client and Connector Versions

First, I check which version of MySQL server and client is installed.

For Linux (Ubuntu/Debian):

mysql --version

dpkg -l | grep mysql

For Linux (CentOS/RHEL):

rpm -qa | grep mysql

For Windows (Command Prompt):

mysql --version

For Windows (PowerShell):

Get-Command mysql | Select-Object Version

If the MySQL version is outdated, I update the MySQL server and client.

Update MySQL Connector for .NET (C#)

For C# applications using MySql.Data, I ensure the latest version is installed:

Install-Package MySql.Data -Version 8.0.33

or update it:

Update-Package MySql.Data

If using MySQL Connector/NET from MySQL Installer, I update it via:

MySQL Installer GUI (Windows) > Select MySQL Connector/NET > Click Upgrade.

Update MySQL Connector for Python

If the issue is in a Python application, I update MySQL Connector for Python:

pip install --upgrade mysql-connector-python

pip install --upgrade pymysql

Update MySQL Connector for Node.js

If a Node.js application is affected, I update the MySQL driver:

npm install mysql2@latest

If using the old mysql package, I recommend switching to mysql2, as it supports modern authentication methods.

Update MySQL Connector for PHP (MySQLi / PDO)

For PHP-based applications, I update MySQL-related packages:

Ubuntu/Debian:

sudo apt update && sudo apt install php-mysql

CentOS/RHEL:

sudo yum update php-mysqlnd

Ensure MySQL Server Supports the Correct Authentication Method

Sometimes, after updating the client, authentication issues arise because MySQL 8+ defaults to caching_sha2_password, while older clients expect mysql_native_password.

I check which authentication plugin is being used:

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

If the plugin is caching_sha2_password but the client requires mysql_native_password, I switch it:

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

Then, I restart MySQL:

sudo systemctl restart mysql

Restart the Application and Verify the Fix

Once the update is done, I:

Restart the application using MySQL to apply the changes.
Test the database connection manually using:
mysql -u myuser -p -h localhost
Check application logs for any remaining issues.

Final Thoughts

As a server administrator, when I encounter MySqlException (0x80004005) due to an outdated MySQL client or connector, I:

Check the installed MySQL client and connector versions.
Update the MySQL connector for the affected language (C#, Python, PHP, Node.js, etc.).
Ensure MySQL authentication is compatible with the connector.
Restart the application and test the connection.

Following these steps ensures a smooth database connection without authentication errors!

Fixing MySqlException (0x80004005) by Updating MySQL Connector or Client – A Server Administrator's Approach

Identify the Installed MySQL Client and Connector Versions

For Linux (Ubuntu/Debian):

For Linux (CentOS/RHEL):

For Windows (Command Prompt):

For Windows (PowerShell):

Update MySQL Connector for .NET (C#)

Update MySQL Connector for Python

Update MySQL Connector for Node.js

Update MySQL Connector for PHP (MySQLi / PDO)

Ensure MySQL Server Supports the Correct Authentication Method

Restart the Application and Verify the Fix

Final Thoughts

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Fixing MySqlException (0x80004005) by Updating MySQL Connector or Client – A Server Administrator's Approach

Identify the Installed MySQL Client and Connector Versions

For Linux (Ubuntu/Debian):

For Linux (CentOS/RHEL):

For Windows (Command Prompt):

For Windows (PowerShell):

Update MySQL Connector for .NET (C#)

Update MySQL Connector for Python

Update MySQL Connector for Node.js

Update MySQL Connector for PHP (MySQLi / PDO)

Ensure MySQL Server Supports the Correct Authentication Method

Restart the Application and Verify the Fix

Final Thoughts

Cloud Windows VDS

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Cloud Solution

For You

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