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Have you tried just typing the <b>netstat</b> command in a DOS command prompt window?
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Have you tried just typing the netstat command in a DOS command prompt window?

Network Solutions 

smart Z

Software Developer / Linux System Administrator

Martyn Spencer

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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. &nbsp;Instead, take any Windows machine with the TELNET client and run this command for each port:<br />
&nbsp; &nbsp;TELNET ServerName PortNumber <br />
If the firewall is blocking the port, you'll get an error message. &nbsp;If the firewall isnot blocking it, and if the port is LISTENING, then you should get a black screen with a blinking cursor. &nbsp;Most apps have no telnet interface, so that'll be all you willsee. &nbsp;If you find one that DOES have an interface, you may actually get a response, but that is immaterial here.
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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.

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I want to check my network and see if certain ports and protocols are already allowed through the firewall, is there a windows &nbsp;tool that I can use to verify this before I poke on the firewall?<br />
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Thank you,
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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,

Looking for a tool to test ports and protocols access

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