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HOW TO FIND A TCP PORT IS OPEN OR NOT

Posted on 2000-03-01
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Last Modified: 2008-02-26
I am using the internet behind a proxy and i want to use web phone, in this case i need certain ports to be opened, is there any way for me to check whether those ports are open.

pls. reply to ganesh@gnmds.global.net.in

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Question by:rganeshs
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by:vujos
ID: 2572397
Hi,

You can use port finding tool like IP Tools (free download at
http://tucows.cgocable.net/pingnt.html)


Hope this helps.
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by:jbeaman
ID: 2572646
Here is a site that you can go to that will allow you to check what ports on your firewall are open:

https://grc.com/x/ne.dll?bh0bkyd2
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by:j2
ID: 2576486
jbeaman: That service only checks which ports have services running. Not which ports are open. There is a difference.

(It will not find a port even if it IS open, unless a service answers)
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Expert Comment

by:OllyW
ID: 2577554
A useful utility for viewing TCP port status on a machine is TCPView at www.sysinternals.com. The tool is great, and sysinternals is one of the best technical sites on the internet for windows - and free.
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frangers99 earned 200 total points
ID: 2630596
I wanted to know a similar question like that once, and the solution is a Portmonitor from http://www.leechsoftware.com it's free and if you keep it running it tells you everyport that is open and constantly keeps updating.

Alternatively you could open a dos window and type netstat and that will tell you all the open ports.
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