Why Am I Getting 'Lost connection to MySQL server at 'reading initial communication packet'' and How Can I Fix It?

Lost Connection to MySQL Server: Diagnosis and Troubleshooting

Encountering the error "Lost connection to MySQL server at 'reading initial communication packet', system error: 0" when attempting to connect to a MySQL database can be frustrating. This error often arises when establishing a connection using a remote IP address, whereas connections to localhost may succeed without issue.

Firewall Interference

One possible culprit is firewall settings. Firewall software, such as PCTools Firewall Plus, may restrict access to MySQL. Verifying firewall configurations and granting full access to MySQL can resolve this issue.

Loopback Binding

Alternatively, the MySQL server may be bound to the loopback IP address (127.0.0.1 or localhost). This binding effectively prevents connections from external sources, including remote IP addresses.

Solution: Upload Script to Webserver

To mitigate this issue if it is determined that the MySQL server is bound to the loopback IP, consider uploading the script to the webserver that hosts the MySQL server. Retain the 'localhost' value when specifying the server host in the connection string. By doing so, you can leverage the connection established by the webserver to access the MySQL server.

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