php Webserver on local machine. Pagekite error: FAIL: localhost:8080 is down

Question

When i try to create a tunnel with $enter code here pagekite.py 8080 xxxx.pagekite.me , and someone trys to connect, there is this error: (FAIL: localhost:8080 is down). I created the website on my local machine with $ php -S localhost:8080. When i try to connect to the server on my local machine with http://localhost:8080 the site works perfectly.