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1

knockd links against libpcap so that it can watch traffic on the wire similarly to any other sniffer like tcpdump or wireshark. This happens at level before iptables DROP rules (which integrate with the IP stack) are able to apply. This is why knockd can see the incoming traffic, and if you ran tcpdump instead it would also be able to see the traffic. ...


0

If you want your port to be released sooner, you have to set the following value: echo 1 > /proc/sys/net/ipv4/tcp_fin_timeout to set it from 60 seconds (default) to 1 second


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To list all TCP sockets accepting connections you could simply use netstat -nlt.


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As @RussellUhl points out in his comment, you are getting a 404 status code from your web server. So you are communicating with the web server, it just can't locate the file you're requesting, and so the firewall is not your problem. You can test this by turning off your Firewall temporarily (via the UI, not by disabling the service) and it should behave ...


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i was all set to give one of the Get-NetTCPConnection answers an upvote, after all it worked on my machine. Sadly it did not work on the Windows 2008 servers that were running Powershell 3.0 that had to do the check. However the following worked perfectly ([Net.NetworkInformation.IPGlobalProperties]::GetIPGlobalProperties()).GetActiveTcpListeners() | ...


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To test your connection, simply try Windows' ftp command line client. Open a command prompt by starting cmd. Wait for the shell window to appear and then run ftp your.ftp.server. If this outputs connection refused, then the port isn't open on the server or your router (or local firewall) are blocking the traffic. If this is successful, you'll see ftp's ...


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Answer not specific to FTP: If you would like to see what ports are open for Inbound traffic on your home router, then from a computer that is inside the router(i.e. on your home network), you an online scanning tool. I'm kind of partial to ShieldsUp! from Steve Gibson, but you can google around and find more. FTP Answer: I've had some issues in the past ...


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21 should be open by default, but to check it in your browser go to http://192.168.1.1 and the username is admin and the password is admin. Once in there you can add a port exption under gaming/port forwarding for 21 on the up of the server


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Be aware that Windows is using dynamic port allocation for some services e.g. Disk Management which is using RPC. Meaning if you want to open a port in your hardware firewall you need to open one of the default defined ports; fore more information see: https://support.microsoft.com/en-us/kb/929851?wa=wsignin1.0 Meaning Microsoft finally uses one of these ...


1

All 1000 scanned ports on 172.31.47.81 are filtered As, indeed they should be. There are several ranges of IPv4 addresses that are reserved for use on private networks. 10.*.*.* 172.16.*.* through 172.31.*.* 192.168.*.* Any address in these ranges can't be directly accessed across the Internet. http://tools.ietf.org/html/rfc1918 ...



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