Why Am I Getting \'Lost Connection to MySQL Server at \'reading authorization packet\'\' Error?

Lost Connection to MySQL Server During Authorization Packet Reading

When attempting to connect to a MySQL server, you may encounter the following error:

ERROR 2013 (HY000): Lost connection to MySQL server at 'reading authorization packet', system error: 0

This error indicates that the connection between the client and server was lost while the server was processing the initial authorization packet from the client.

Potential Causes and Solutions

1. High Connect Timeout:

If the connect_timeout value in your MySQL configuration (my.cnf) is set too low, the server may abort the connection attempt before it can complete the authorization process. Increase the connect_timeout to at least 10 seconds or more as needed.

2. Missing Host Permissions:

Check your /etc/hosts.allow and /etc/hosts.deny files to ensure that the client host is explicitly allowed to connect to the MySQL server. If applicable, add the following line to /etc/hosts.allow:

mysqld: ALL: allow

3. Network Issues:

Firewall settings or other network issues can disrupt the connection between the client and server. Verify that the necessary ports (3306 by default) are open and that there are no firewalls blocking communication.

4. Outdated MySQL Version:

MySQL version 5.1.69 is known to have issues with this error. Upgrade to a newer version of MySQL to address any potential compatibility issues.

5. F5 Load Balancing Configuration:

If you are using F5 load balancing, check the configuration and ensure that the MySQL Proxy iRule is properly configured to handle the client authorization process.

Additional Tips

• Run the command SHOW GLOBAL STATUS LIKE 'Aborted_connections'; to check for aborted connections.
• Examine the MySQL error log for additional clues about the cause of the error.
• Make sure the server is not behind a proxy that is modifying the client-server communications.

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