You might create a rule for the target in question which  logs when it matchs 
and obey the logfile for this entry and adjust the rule if found . Time based 
revert the ruleset or select an other target which is visited  (and also 
logged) for turning the access off.   


Am 6. März 2015 10:26:08 MEZ, schrieb Erich Titl <erich.t...@think.ch>:
>Hi Juergen
>
>Am 06.03.2015 um 07:18 schrieb j...@tux-net.de:
>> Why should the access to these update servers be enabled dynamically?
>
>I could enable that access statically, but that would mean I have to
>adapt the firewall policies to a peripheral functionality. As I want to
>add this functionality to the mainstream, I don't want to force users
>to
>adapt the firewall policy.
>
> What is the security policy behind it?
>
>Access to the outside services from the firewall itself is limited to a
>small set of functions. I _believe_ this is the standard.
>
>Are the clients i.e mobile devices?
>> Either you trust the targed or you do not. 
>
>Right, this is not the problem, I must trust the target. We may use
>signed containers to enhance this trust.
>
>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?
>
>Both is not as relevant, the problem is just that the firewall may not
>have access at a given time, because the policy is set this way.
>
>cheers
>ET
>
>
>
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