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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?


    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


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

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