CI_Xmlrpc::server()

server($url[, $port = 80[, $proxy = FALSE[, $proxy_port = 8080]]])

Sets the URL and port number of the server to which a request is to be sent:

$this->xmlrpc->server('http://www.sometimes.com/pings.php', 80);

Basic HTTP authentication is also supported, simply add it to the server URL:

$this->xmlrpc->server('http://user:[email protected]/', 80);