咨询：为何无法通过MySQL Workbench连接MySQL数据库？

Hey there, let's tackle this tricky issue you're facing. You mentioned that you can connect to your MySQL Community Server 8.0.11 just fine via the command line using mysql -u root -p -h 127.0.0.1 -P 3306, but clicking the default connection in MySQL Workbench 6.3 CE throws an error with no extra details. Here's what's going on and how to fix it:

Root Cause #

The most likely culprit is compatibility between the old Workbench version and MySQL 8.0's new authentication system. MySQL 8.0 introduced the caching_sha2_password authentication plugin as the default, but Workbench 6.3 CE doesn't fully support this newer plugin—hence the vague error when trying to connect.

Solutions to Try #

1. Upgrade MySQL Workbench (Recommended)

The cleanest fix is to update your Workbench to version 8.0 or later. Newer Workbench releases are built to handle MySQL 8.0's authentication mechanisms seamlessly, and you'll also get access to other bug fixes and improvements that come with the update.

2. Switch the Root User's Authentication Plugin (Temporary Fix)

If you can't upgrade Workbench right now, you can modify your root user to use the older mysql_native_password plugin that Workbench 6.3 CE understands. Here's how:

• First, log into your MySQL server via the command line (you already know how to do this!):

  mysql -u root -p -h 127.0.0.1 -P 3306
  

• Run these SQL commands to update the user's authentication method:

  ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your-root-password-here';
  FLUSH PRIVILEGES;
  

• Restart your MySQL service, then try connecting with Workbench again—it should work now.

3. Tweak Workbench Connection Settings

Double-check your default connection's configuration in Workbench to rule out small oversights:

• Make sure the host is set to 127.0.0.1 instead of localhost (some older Workbench versions have issues resolving localhost correctly on Windows)
• Confirm the port is 3306 (matches your server's listening port)
• Click the Test Connection button in the connection setup window—sometimes this will show a more detailed error message than just clicking the connection directly.

Bonus: Check MySQL Error Logs #

If none of the above works, take a look at your MySQL error log (usually located in the data folder of your MySQL installation, named something like [your-computer-name].err). The log will likely have a detailed entry explaining why Workbench's connection attempt failed, which can point you to the exact issue.

内容的提问来源于stack exchange，提问作者user2712674