Update authentication.php

core/authentication/resources/classes/authentication.php

@@ -420,7 +420,7 @@ class authentication {
 			}
 
 		//remote port number from the domain name
-			$domain_array = explode(":", $domain_name);
+			$domain_array = explode(":", $this->domain_name);
 			if (count($domain_array) > 1) {
 				$domain_name = $domain_array[0];
 			}