Why should the access to these update servers be enabled dynamically? What is 
the security policy behind it?  Are the clients i.e mobile devices?   
Either you trust the targed or you do not. Do you want to control the traffic?  
  Or do you want to be sure that the all clients get the same software version 
at a  given time?    

JN
       

Am 6. März 2015 00:24:21 MEZ, schrieb Erich Titl <erich.t...@think.ch>:
>Hi
>
>Am 05.03.2015 um 20:40 schrieb Northe, Juergen [tux-net]:
>> Hi, 
>> what should be the reason to change the rules ? Time based ? On
>demand from "outside" ? Port knocking?I
>
>Most communication on my firewall towards the net is disabled by
>default. In order to update the software dynamically I need to have
>access to an uplink web server.
>
>cheers
>
>ET
>
>
>
>
>
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