This is a common issue faced when trying to establish a connection to a MySQL database using login credentials, and can occur for several reasons.
The first step is to verify that the database credentials used in the PHP code match those used to create the database and user on the MySQL server. Ensure that the username, database name, and password are all correct.
Next, check the database connection code to ensure that it is using the correct hostname or IP address for the MySQL server. The hostname should match the server where the MySQL database is hosted, which may not necessarily be the same as the web server hostname.
If the above steps do not resolve the issue, it's worth checking if the MySQL server is running and listening on the expected port. This can be verified by using tools like 'netstat' or 'lsof' to check if the MySQL process is active and listening on the port you are trying to connect to.
Additionally, ensure that there are no firewall or network restrictions blocking the connection between the web server and the MySQL server. The firewall rules should allow traffic on the appropriate port to the MySQL server.
If all else fails, consult the MySQL documentation or seek assistance from the MySQL support team to further troubleshoot the issue and determine the exact cause of the connection failure.
The above is the detailed content of Here are a few title options, incorporating the question-answer format: * **Why Can\'t I Connect to My MySQL Database?** * **Trouble Connecting to MySQL: What\'s the Issue?** * **MySQL Connection Err. For more information, please follow other related articles on the PHP Chinese website!