To check a customerOrhost networking application using socket programming, It is possible to free webhost that will let me open Server electrical sockets and listen on the port?

I believe that could be difficult to find. I am unsure why it's necessary though. You can look at this about the LAN. If you wish to test running your application on the internet, you can set on side in a different location (like in your own home).

Any free spend hosting service with reasonable limits (as lengthy as the port number is free of charge on the given spend server) -- see http://world wide web.red-colored-pill.eu/freeunix.shtml. They are free websites, which means you should most likely nicely request administrator if it can be done though -- particularly if your merchandise needs more cpu/bandwidth.