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Tag Archives: tcp

April, 2010

  • 13 April

    Testing your Firewall

    Just because you spent the better part of a day hammering down the security bolts on your ironclad server, it does not mean your server is secure. Being human, you could have overlooked something small but potentially devastating. The only real way to test the effectiveness of any security measure …

November, 2009

  • 24 November

    How to open and close ports with iptables

    Question: How do I open and close ports with an iptables firewall setup? Answer: You can easily open ports on a dedicated server with these simply commands. Depending on whether you need to open a UDP or TCP port, use one or both of the following: iptables -A INUPT -p …