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Thread: Determining Port Assignments

  1. #1
    ytestt Guest

    Default Determining Port Assignments

    I created an Excel application, which retrieve stocks prices from To restrict its port access is there a rule of thumb for port assignment? Which port should I assign to Excel? Should I use UDP, TCP, or both protocols? How do I determine which protocol to use for a given program? On the Security tab, Filter Options, should I enable privacy for the program?

  2. #2
    Join Date
    Dec 2002
    Mikado Michigan

    Default Re: Determining Port Assignments

    Actually I think in your case you need to go to Yahoo and find out what ports they use.
    My homes are and and

    Consumer Security - 2011 & 2012

    Tilting at windmills hurts you more than the windmills.
    -From the Notebooks of Lazarus Long
    Senior of the Howard Families

  3. #3
    ytestt Guest

    Default Re: Determining Port Assignments

    For the Excel application, I decided to assign port 20. I found out via that port 20 is used for ftp-data. Subsequently, I got the idea of which port to assign in general by observing which port(s) are blocked via the privacy advisor alert. At first, I just assign any port and if that is not sufficient or does not work, the privacy advisor indicates which port is not accessible. I then assign the inaccessible port.

  4. #4
    rakerman Guest

    Default Re: Determining Port Assignments

    The Internet Assigned Numbers Authority (IANA) maintains the authoritative list of port number assignments.

    You can also find more information about port numbers on my web page

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