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How can I test whether a port is open on a firewall?

Last response: in Networking
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November 23, 2011 9:03:21 PM

I travel a lot and use wifi in a lot of different places (hotels, airports, etc.)

My apps don't always work and I suspect that in some instances the broadband provider is blocking some of the ports I need.

I don't need a port scanner like NMAP since that scans a target IP for listening ports. What I need is a way to figure out whether some firewall between my PC and the Internet is blocking specific UDP or TCP port ranges.

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November 23, 2011 11:51:15 PM

Carl Galt said:
I travel a lot and use wifi in a lot of different places (hotels, airports, etc.)

My apps don't always work and I suspect that in some instances the broadband provider is blocking some of the ports I need.

I don't need a port scanner like NMAP since that scans a target IP for listening ports. What I need is a way to figure out whether some firewall between my PC and the Internet is blocking specific UDP or TCP port ranges.



Firebind is a site that was designed for this purpose. They have a java app that can test any of the 65535 TCP or UDP ports to see whether there is a firewall blocking them.

You can test a single port or a range of ports. They also have some canned tests.

www.firebind.com
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February 12, 2012 1:51:23 AM

Best answer selected by Carl Galt.
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