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Accepted
Kieran Walsh
Asked: 2011-04-07 15:16:18 +0800 CST

How can I check if a particular port is open from one site to another?

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I want to know if port 139 TCP is open from a server on one domain to another. How would I do this?

I know that I can use Telnet to test port 25 to a server with Exchange installed - but that only works because Exchange answers the telnet request - is that right?

How do you test the link if there is no program on the other end that will respond to telnet for example?

windows-server-2008 firewall networking port port-forwarding

2 Answers

  1. Best Answer

    Check out nmap: http://nmap.org/

    nmap -p 25 example.com

    Cheers

    • 3

  2. Just use

    telnet myserver.com 139

    If you're on a Linux/Unix box, I recommend you to check nc

    man nc
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