Some web applications are assigned a port number (for example 2345) when they are created. Until now these ports have been exposed to the outside world meaning that you could view your application via http://www.example.com:2345 as well as http://www.example.com
From July 30th these ports will be closed to the outside world. This means that while http://www.example.com continues to work, http://www.example.com:2345 will stop working.
You can open a ticket and ask for your port(s) to be open to the outside world and we will open them on a case by case basis.