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How can an applet detect whether its running behind a firewall or not?

April 26, 2017applet detect firewall running

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How can an applet detect whether its running behind a firewall or not?

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Location: http://www.jguru.com/faq/view.jsp?EID=438793 Created: Jun 13, 2001 Author: Finlay McWalter (http://www.jguru.com/guru/viewbio.jsp?EID=13911) Question originally posed by Rajesh Ajmera (http://www.jguru.com/guru/viewbio.jsp?EID=47656 There is no sure way, a problem compounded by the fact that there is no single definition of what a “firewall” is. In many places there is no direct IP connectivity through the firewall – in those cases only an HTTP (and maybe other protocols) proxy exists. A lookup of a public machine (e.g. the one from which the applet was downloaded) using InetAddress will probably fail – if this happens then your applet will probably only be able to perform outgoing HTTPConnections.