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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
you can use a pair of commands to test firewalls.
1st launch this command at destination machine
ncat -l [-u] [port] | cat
then use this command at source machine to test remote port
echo foo | ncat [-u] [ip address] [port]
First command will listen at specified port.
It will listen TCP. If you use -u option will listen UDP.
Second command will send "foo" through ncat and will reach defined IP and port.
Using netcat, usuallly installed on debian/ubuntu.
Also to test against a sample server the following two commands may help
echo got milk? | netcat -l -p 25
python -c "import SocketServer; SocketServer.BaseRequestHandler.handle = lambda self: self.request.send('got milk?\n'); SocketServer.TCPServer(('0.0.0.0', 25), SocketServer.BaseRequestHandler).serve_forever()"
this command will send a message to the socket 25 on host 192.168.1.2 in tcp.
works on udp and icmp
understand only IP address, not hostname.
on the other side (192.168.1.2), you can listen to this socket and test if you receive the message.
easy to diagnose a firewall problem or not.