Connection to server failed / closed error [closed]

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http://unix.stackexchange.com – There is a website of a browser game http://tankionline.com. I can open the website but when I try to connect from either Ubuntu or Mint to any of their servers for playing it gives me an error message like connection to server ... failed or something similar. I assume this is the firewall issue but any solution which I can google does not help me. Any idea on how to solve it is appreciated. Thank you. (HowTos)