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Tom's Hardware > Forum > General Networking > Firewalls > [Solved] How can I test whether a port is open on a firewall?

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

Forum General Networking : Firewalls [Solved] How can I test whether a port is open on a firewall?

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Carl Galt   11-24-2011 at 12:03:21 AM

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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ProtocolGeek   11-24-2011 at 02:51:15 AM
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Carl Galt wrote :

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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