What are the potential causes of authentication errors when using PDO Informix for database connections in PHP?

Authentication errors when using PDO Informix for database connections in PHP can be caused by incorrect username or password, insufficient permissions for the user, or misconfigured Informix server settings. To solve this issue, double-check the credentials being used in the connection string, ensure the user has the necessary permissions to access the database, and verify that the Informix server is properly configured to allow the connection. 

try {
    $dbh = new PDO("informix:host=hostname; service=port; database=dbname; server=server_name; protocol=onsoctcp; EnableScrollableCursors=1;", "username", "password");
    echo "Connected to database";
} catch (PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}

Keywords

PDO Informix authentication errors database connections PHP

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