try ping

siteBuilder.php

@@ -54,7 +54,7 @@ function siteBuilder_MetaData() {
  * @return array
  */
 function siteBuilder_Testconnection($params) {
-	$siteBuilder = new ApiClient($params['serverhttpprefix']. '//' . $params['serverhostname'], $params['serveraccesshash']);
+	$siteBuilder = new ApiClient(getSiteBuilderApiURL($params), $params['serveraccesshash']);
 	$response = $siteBuilder->ping($params['serverusername'], $params['serverpassword']);
 	if($response == 'pong') {
 		return array(