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The cPanel remote MySQL issue with the error message:

WARNING [2] mysql_connect(): OK packet 6 bytes shorter than expected

usually occurs when attempting to connect remotely to a MySQL database from an external application or server. This issue is commonly related to MySQL authentication settings, old password formats, or incorrect remote MySQL configuration.

In this guide, we will explain how to diagnose and fix the cPanel remote MySQL issue step by step.

Understanding the Error

The error message may appear similar to the following:

WARNING [2] mysql_connect(): OK packet 6 bytes shorter than expected,
Line: 34 in file C:\inetpub\local_intranet\website_updater.php

This indicates that the remote application is unable to communicate properly with the MySQL server because of authentication or protocol compatibility issues.

Common Causes of cPanel Remote MySQL Issue

Some common reasons for this issue include:

• Incorrect MySQL server details
• Invalid MySQL username or password
• Remote MySQL access not enabled in cPanel
• Old MySQL password authentication enabled
• MySQL client and server version mismatch

Step 1: Verify Remote MySQL Connection Settings

Before troubleshooting further, confirm that the following MySQL connection parameters are correct:

Parameter	Value
MySQL Server	Server IP Address
Port	3306
Username	MySQL username
Password	MySQL user password

Example:

• Server IP: 192.168.1.10
• Port: 3306
• Username: username_test

Also ensure that the remote IP address is added in the Remote MySQL section inside cPanel.

Step 2: Test Remote MySQL Connection

Login to the remote Linux server and test the MySQL connection manually.

mysql -h server_ip -u my_sql_username -p

Example:

mysql -h 192.168.1.10 -u username_test -p

After entering the password, successful output should look similar to this:

Welcome to the MySQL monitor.

Your MySQL connection id is 15054
Server version: 5.0.9-community MySQL Community Edition (GPL)

mysql> show databases;

If the databases are displayed correctly, then the remote connection is working properly.

How to Fix the cPanel Remote MySQL Issue

If the error still appears, follow the steps below.

Step A: Edit MySQL Configuration File

Open the MySQL configuration file:

vi /etc/my.cnf

Step B: Modify old-passwords Setting

Locate the following line:

old-passwords = 1

Change it to:

#old-passwords = 1

This disables old password authentication temporarily.

Step C: Restart MySQL Service

Restart the MySQL service after saving the changes.

service mysql restart

or on some systems:

systemctl restart mysqld

Step D: Reset the MySQL User Password

Change the password of the MySQL user. You can use the same password again.

Example:

SET PASSWORD FOR 'mysql_user'@'host' = PASSWORD('your_password');

This updates the password using the newer authentication format.

Step E: Re-enable the Old Password Line

Now uncomment the line again if required.

old-passwords = 1

Step F: Restart MySQL Again

Restart MySQL once more for the changes to take effect.

service mysql restart

Why This Fix Works

Older MySQL password formats may not work correctly with newer clients or remote applications. Temporarily disabling old-passwords allows MySQL to regenerate the password using the updated authentication method.

This resolves protocol mismatch issues that cause the:

OK packet 6 bytes shorter than expected

error during remote MySQL connections.

Additional Troubleshooting Tips

If the issue continues, also verify:

• Firewall allows port 3306
• Remote MySQL access is enabled in cPanel
• Correct hostname or IP address is used
• SELinux is not blocking MySQL connections
• MySQL service is running properly

Conclusion

The cPanel remote MySQL issue with the error message “WARNING [2] mysql_connect(): OK packet 6 bytes shorter than expected” is commonly caused by old password authentication settings or incorrect remote MySQL configuration.

By verifying the connection details, testing remote access, updating the old-passwords setting, and resetting the MySQL user password, you can successfully resolve the issue and restore remote database connectivity.

If you require help, contact SupportPRO Server Admin