Sorry for my ignorance, how do you check/set port 4242 in your wallet.

One of the simplest methods to open the port is to use a uTorrent: go to "Preferences" >> "Connection", opposite the "Port used for incoming connections" put 4242 and click on "Ok".

To check is your port opened or closed: http://www.yougetsignal.com/tools/open-ports/ , http://ping.eu/port-chk/.
If this method is not working for you but you want to open the port for incoming connections,  send me in PM your router model and firewall name and I will try to help you.