Looking for a tool to test ports and protocols access

I want to check my network and see if certain ports and protocols are already allowed through the firewall, is there a windows  tool that I can use to verify this before I poke on the firewall?

Thank you,
SR ZakNetwork Solutions Asked:
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Andrew LeniartFreelance JournalistCommented:
Have you tried just typing the netstat command in a DOS command prompt window?
Andrew LeniartFreelance JournalistCommented:
I have full page of port ranges I want to check

Would this site be of any help?


It checks Port Ranges and then reports on their state.

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Prabhin MPDevOps EngineerCommented:
use nmap tool to check the port or service.

nmap is fully on command line,
there is GUI for this called Zenmap.

Bill BachPresident and Btrieve GuruCommented:
Running NETSTAT -A on the server will give you a list of LISTENING ports, but that won't tell you for sure if the firewall is allowing them through.  Instead, take any Windows machine with the TELNET client and run this command for each port:
   TELNET ServerName PortNumber
If the firewall is blocking the port, you'll get an error message.  If the firewall isnot blocking it, and if the port is LISTENING, then you should get a black screen with a blinking cursor.  Most apps have no telnet interface, so that'll be all you willsee.  If you find one that DOES have an interface, you may actually get a response, but that is immaterial here.
Shaun VermaakTechnical SpecialistCommented:
PortQry is old but it still works well. It gives back the port state like NETSTAT
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