MySQL Error 2013: Lost Connection to Server - What Could be the Culprit?

Lost Connection to MySQL Server: Error 2013

When attempting to connect to MySQL, the error "ERROR 2013 (HY000): Lost connection to MySQL server at 'reading authorization packet', system error: 0" may occur.

Possible Causes and Solutions:

1. Incorrect Firewall Configuration:

Ensure that the firewall is allowing connections to the MySQL port (default 3306).

2. High Network Latency:

Increase the 'connect_timeout' value in the MySQL configuration file (my.cnf) to accommodate potential network delays.

3. Authentication Issue:

Verify that the username/password is correct and that the client is connecting to the appropriate database.

4. MySQL Version Incompatibility:

Ensure that the client and server MySQL versions are compatible. In this case, the server version is 5.1.69-log, which may not be compatible with the client.

5. F5 Load Balancer Configuration:

If using an F5 load balancer, check the configuration and ensure that it is correctly directing traffic to the MySQL server.

6. Hosts Files Permissions:

On Unix systems, check the /etc/hosts.allow and /etc/hosts.deny files to ensure that the MySQL service is allowed.

7. SSL Certificate Issues:

If using SSL, verify that the certificate and configuration are valid.

8. High Initial Connections:

Monitor the 'Aborted_connections' status variable using "SHOW GLOBAL STATUS LIKE 'Aborted_connections';". High values indicate excessive initial connection attempts.

Additional Tips:

• Use a MySQL client like "mysql -u username -p" to connect and debug the issue further.
• Check error logs in /var/log/mysql (Linux) or C:Program FilesMySQLMySQL Server 5.7logs (Windows).
• Consider using a packet sniffer like Wireshark to analyze network traffic.

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