Troubleshooting MySQL Error 2015 – CR_NAMEDPIPE_CONNECTION: Issues with Named Pipe Connections

When working with MySQL on Windows, you might encounter Error 2015, which is related to connecting through a named pipe. The error message typically looks like this:

Error 2015: CR_NAMEDPIPE_CONNECTION %s via named pipe

This error indicates that the MySQL client cannot establish a connection to the MySQL server using the named pipe method.

Understanding the Error

Named pipes are a method for inter-process communication on Windows. MySQL can use named pipes to connect to the server if it’s configured to do so. Error 2015 occurs when there is an issue with this communication channel.

Diagnosing the Issue

To diagnose and address this error, consider the following steps:

1. Verify Named Pipe Settings

Ensure that the MySQL server is configured to support named pipe connections. Check the server’s configuration file (my.ini) for the named_pipe parameter under the [mysqld] section:


If this line is missing or commented out, add or uncomment it, then restart the MySQL server.

2. Check Named Pipe Name

By default, MySQL uses MySQL as the named pipe name. If you’ve changed the default named pipe name in the server configuration, ensure the client is using the same name when attempting to connect. You can specify the named pipe name on the client side with:

mysql --protocol=PIPE --socket=pipe_name

Replace pipe_name with the name of your named pipe.

3. Confirm MySQL Server Permissions

The MySQL server needs the appropriate Windows permissions to create a named pipe. Check that the MySQL service is running under an account with sufficient privileges.

4. Inspect Client Connection Command

When connecting with the MySQL client, ensure you’re using the correct protocol and pipe name. For example:

mysql --protocol=pipe --host=.

Using --host=. specifies that the client should connect to the server on the same machine via a named pipe.

5. Check Server Availability

Verify that the MySQL server is running and accessible. If it’s not running, start the MySQL service:

net start mysql

6. Review Windows Named Pipe Settings

Windows has its own named pipe settings that may affect MySQL’s ability to use them. Ensure that named pipes are enabled and functioning correctly on your system.

7. Examine Security Software

Security software or firewalls might block named pipe communication. Check that your security settings allow for named pipes to be used.

8. Test Named Pipe Connectivity

You can use Windows tools to test named pipe connectivity. Attempt to connect to the named pipe using a tool like Sysinternals’ pipelist to see if the MySQL named pipe is available.

9. Use TCP/IP as an Alternative

If named pipes continue to be problematic, consider using TCP/IP to connect to the MySQL server instead. You can change the connection protocol in the client command:

mysql --protocol=tcp --host= --port=3306

Replace and 3306 with your server’s IP address and MySQL port if different.

By following these steps, you should be able to diagnose and resolve MySQL Error 2015 related to named pipe connections. Always ensure that both the MySQL server and client configurations are aligned in terms of named pipe settings, and that your Windows environment is correctly set up to support this method of communication.

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