Why Am I Getting \'ERROR 2013 (HY000): Lost Connection to MySQL Server at \'Reading Authorization Packet\'?\'

Understanding "ERROR 2013 (HY000): Lost Connection to MySQL Server at 'Reading Authorization Packet'"

When attempting to connect to a MySQL server, users may encounter the error "ERROR 2013 (HY000): Lost connection to MySQL server at 'reading authorization packet', system error: 0." This error commonly occurs in scenarios where the client is attempting to establish an initial connection to the server.

Potential Solution

To resolve this issue, consult the MySQL documentation. It suggests that increasing the connect_timeout value may help. This value determines the maximum amount of time the server will wait for the client to perform the initial handshake and authentication. By adjusting this timeout to a larger value (e.g., 10 seconds), the connection establishment may be allowed to complete successfully.

Another Perspective

Another possible cause for this error involves the configuration of firewall rules. In Unix-based systems, verify the contents of the /etc/hosts.allow and /etc/hosts.deny files. Ensure that the line "mysqld: ALL: allow" is present in /etc/hosts.allow to permit connections from all hosts. Alternatively, check if the host in question is listed in /etc/hosts.deny to block connections.

Troubleshooting Tips

In addition to the suggested solutions, further troubleshooting steps include:

• Examining the server logs for any additional error messages that may provide context.
• Adjusting the my.cnf configuration file to modify the connect_timeout setting.
• Consulting the F5 administrator for insights into the connection logs from the load balancer.
• Verifying the MySQL server version. The error has been known to occur with older versions of MySQL (e.g., 5.1.69-log). If applicable, consider upgrading to a newer version.

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