Why Am I Getting \'Error 2013 (HY000): Lost Connection to MySQL Server\'?

Lost Connection to MySQL Server: Understanding Error 2013

MySQL's "Error 2013 (HY000): Lost connection to MySQL server at 'reading authorization packet'" commonly occurs when the connection is interrupted during the authentication process. Here are the potential causes and solutions to address this issue:

1. Low Connect Timeout:

This error can manifest if the connect_timeout in your MySQL configuration file (my.cnf) is set too low. By increasing the value to 10 or more seconds, the server will have more time to establish the connection before timing out.

[mysqld]
connect_timeout = 10

2. Firewall Issues:

Firewall settings can prevent the MySQL server from establishing a connection with clients. Ensure that the MySQL port (default: 3306) is open on the firewall.

3. Misconfigured Network:

Verify that the server and the client are using compatible IP addresses and that there are no routing issues between them.

4. Incorrect DNS Configuration:

DNS misconfigurations can lead to incorrect name resolution, causing connection problems. Ensure that the server hostname and client IP addresses are correctly mapped in the DNS.

5. Server or Client Authentication Errors:

If the error occurs during authentication, check the MySQL logs for any issues related to user authentication. Ensure that the username and password are correct and that the user has the necessary privileges to connect to the database.

6. Old MySQL Version:

MySQL version 5.1.69-log is known to have this particular issue. Upgrading to a newer version of MySQL may resolve the problem.

7. Hosts File Modification:

On platforms like FreeBSD, the hosts file needs to include an entry for the MySQL server. Add a line to /etc/hosts.allow, allowing access for the MySQL server:

mysqld: ALL: allow

8. Log Analysis:

Examine the contents of /var/log/secure and the MySQL error log to gather additional information about the error. This can help identify any potential issues that may be causing the connection to be lost.

These troubleshooting steps should assist in resolving the "Error 2013 (HY000)" when connecting to MySQL.

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