Port not open

Posted on 2011-04-26
Last Modified: 2012-05-11
New box with Windows Server 2008 R2. There is specific software that needs to establish a session using ports 5001>5021. I have created seperate rules for TCP & UDP traffic and it will not work. Another software that uses Telnet - will work however. I also am not able to telnet into any of those ports locally or from another box.

Question by:gwg80
    LVL 82

    Expert Comment

    by:Dave Baldwin
    What program on the server is listening on those ports?  You can't telnet to a port without a listener that can respond.

    Author Comment

    Vendor provided software. I will look into that tomorrow.
    LVL 13

    Accepted Solution

    Have you also tried to stop Windows 2008's firewall to check your software is working or not ?

    Furthermore, are you sure that your firewall rule step is correct ?

    How to configure the new Windows Server 2008 advanced firewall MMC snap-in

    How to use the "netsh advfirewall firewall" control Windows Firewall behavior
    LVL 10

    Assisted Solution

    Do a netstat on the server to make sure the software is really listening on the designated ports. If so, then try using a port scanner (like nmap) on the server to verify the service is accessible. Most likely the app doesn't listen on all ports but will communicate on any one in that range so the netstat should tell you what it is listening on. Let me know if you have any questions on this.

    nmap command:

    nmap -vv -sT -PN -p 5001-5021 <hostname or IP>

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