Why am I Getting \'Lost Connection to MySQL Server at \'reading authorization packet\', system error: 0\' Error When Using F5 Load Balancing?

Lost Connection to MySQL Server: "reading authorization packet" Error

Debuggers encounter the error "ERROR 2013 (HY000): Lost connection to MySQL server at 'reading authorization packet', system error: 0" when attempting to establish server connections. This issue typically arises when implementing load balancing capabilities using F5 and can be further exacerbated by high latency or slow connections.

Diagnosis and Resolution

To resolve this issue, several approaches can be undertaken:

1. Increase Connect Timeout: According to MySQL documentation, this error can occur if the connect_timeout value is too low. Increasing it to a higher value, such as 10 seconds, can allow the server more time to establish the connection. You can confirm this cause by checking the 'aborted_connections' status using the command 'SHOW STATUS LIKE 'aborted_connections''.
2. Firewall Configuration: Ensure that the firewall settings allow connections from the F5 load balancer IP to the MySQL server ports.
3. MySQL Version: Certain versions of MySQL (e.g., 5.1.69-log) have been known to exhibit this issue. Upgrading to a newer version may resolve the problem.
4. Hosts File and Authentication: On non-FreeBSD Unix systems, verify the /etc/hosts.allow and /etc/hosts.deny files. Ensure that the host is allowed in /etc/hosts.allow and not listed in /etc/hosts.deny. If necessary, add the line "mysqld: ALL" to /etc/hosts.allow.
5. F5 Configuration: Examine the F5 log to identify any errors or issues that may be causing the connection loss.

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