Troubleshooting MySQL Error 2017 (CR_NAMEDPIPEOPEN_ERROR): A Guide to Fixing Named Pipe Issues

When working with MySQL on Windows, you might encounter Error 2017, which is related to issues with named pipes. This error message typically reads: “Can’t open named pipe to host: %s pipe: %s (%lu)” and indicates that the MySQL client cannot establish a connection with the MySQL server via the named pipe mechanism.

Understanding Error 2017

Named pipes are a method for inter-process communication on Windows. MySQL uses named pipes as one of the connection methods, which can be faster than TCP/IP for local connections. However, if the named pipe cannot be accessed or opened, you will encounter Error 2017.

Diagnosing Error 2017

To diagnose this error, you need to verify several factors, including MySQL configuration, permissions, and the status of the MySQL server.

Scenario 1: MySQL Configuration

Check if named pipes are enabled in the MySQL configuration file (my.ini). Look for the named_pipe parameter under the [mysqld] section:


If this line is missing or commented out, add or uncomment it to enable named pipes.

Scenario 2: Permissions

Ensure that the user account running the MySQL client has the necessary permissions to access the named pipe. The user must have Full Control permissions for the MySQL named pipe.

Scenario 3: Firewall or Antivirus Software

Firewall or antivirus software might block named pipe connections. Temporarily disable the firewall or antivirus and try connecting again. If this resolves the issue, add an exception for the MySQL named pipe in your firewall or antivirus settings.

Scenario 4: MySQL Server Not Running

Verify that the MySQL server is running. If it’s not, the named pipe won’t be available. Start the MySQL server and attempt to connect again.

Scenario 5: Incorrect Named Pipe

Make sure you are using the correct named pipe. The default named pipe for MySQL is MySQL, but this can be changed in the configuration file. If you’re unsure, check the my.ini file for the socket parameter under the [mysqld] section:


Use the correct named pipe in your connection string:

mysql --protocol=PIPE --socket=\\.\pipe\MySQL -u username -p

Scenario 6: Server Restart Required

If you’ve changed the MySQL configuration to enable named pipes, you will need to restart the MySQL server for changes to take effect.



Error 2017 (CR_NAMEDPIPEOPEN_ERROR) in MySQL usually indicates a problem with the configuration or accessibility of named pipes. By checking the MySQL configuration, ensuring proper permissions, managing firewall settings, confirming the MySQL server is running, using the correct named pipe, and restarting the server if necessary, you can resolve this error and establish a successful connection using named pipes. Remember to always back up your configuration files before making changes.

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