title: Why some internet providers close certain ports?
body: <p>We published the game on russian server and 1% of people couldn't connect to server on 46xx port through raw TCP while they can load it's HTML page (through HTTP). Most of such people live in Germany, Israel....
  Why is it so? What's the politics decisions lay behind it? We discovered that their such ports (which are free on IANA) are closed. Does it mean that such people cannot run Steam (and, then, play all games which you can buy through it), play WoW and many other modern games which use TCP through 4xxx ports?
  Thank you.</p>