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Thread: How can the port be opened when the firewall is activated?

  1. #1

    Red face How can the port be opened when the firewall is activated?

    Hi,

    I don't understand how that can possibly happen. What's the szeanrio?:
    A D-Link modem-router is configured as bridge and connected to the Asus 700ge, which establishes the ADSL PPoE connection.
    The firewall is switched on. Lan-to-Wan and Wan-to-Lan Filters are disabled. There are currently no Virtual servers or DMZ defined.
    So is it possible that a specific 5 digit Portnumber is opened, while the ones around it are stealthed by the firewall?

    Any idea? I enabled UPnP under IP-Config=>Misc. and an application running on the system uses the open port, which I found.
    Enabling UPnP, does that meanthat a client (or an app running on it) can open temporarly a port which is required? If so, do you consider this as an security problem and how for long is the port opened?

    Thanks for your answers

    Bye

    antoschka
    Last edited by antoschka; 22-02-2007 at 14:05. Reason: Problem and Question

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