How use a Printer/Print Server connected in a different network

try
{
    ConnectionOptions connection = new ConnectionOptions();
    connection.Username = "username";
    connection.Password = "password";
    connection.Authority = "ntlmdomain:DOMAINNAME";
    connection.Impersonation = ImpersonationLevel.Impersonate;
    ManagementScope scope = new ManagementScope("\\\\Servers' public ip\\root\\CIMV2", connection);
    scope.Connect();

    ManagementObject classInstance =
        new ManagementObject(scope,
        new ManagementPath("Win32_Printer.DeviceID='\\\\Servers' public ip\\Printer name'"),
        null);

    // no method in-parameters to define


    // Execute the method and obtain the return values.
    ManagementBaseObject outParams =
        classInstance.InvokeMethod("PrintTestPage", null, null);

    // List outParams
    Console.WriteLine("Out parameters:");
    Console.WriteLine("ReturnValue: " + outParams["ReturnValue"]);


}
catch (ManagementException err)
{
    Console.WriteLine("An error occurred while trying to execute the WMI method: " + err.ErrorCode);
}
catch (System.UnauthorizedAccessException unauthorizedErr)
{
    Console.WriteLine("Connection error (user name or password might be incorrect): " + unauthorizedErr.Message);
}