why firewall prohibit the use of ftp & smtp except of http?

Posted on 2004-11-18
Last Modified: 2013-11-16
why firewall prohibit the use of ftp & smtp except of http?
Question by:she1
    1 Comment
    LVL 41

    Accepted Solution

    firwallos do prevent http, at least incoming requests
    and firewalls don't block smtp or ftp (at least outgoing requests)
    a request from the inside will trigger the port to open
    http, or ftp or smtp
    but an unsolicited request from the outside will be rejected
    see here
    and here

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