Ahmed Matar wrote:
>
> I am in urgent need of the port numbers that are usually open on most
> firewalls so that applications can transmit information to users on those
> ports who are behind firewalls. As far as I know (correct me if I am wrong),
> but most firewalls (e.g. Microsoft Proxy 2.0) have special ports open for
> some well-known applications such as the RealPlayer and also have a number
> of ports open for all other applications to use. I've been trying to find
> these ports numbers on the net, but have not suceeded in doing so. Please if
> anybody has this information please send it to me. The reason I'm asking
> this question is because I am creating a application that plays streamed
> audio transmitted to it from another application running on a remote
> webserver. I want users behind firewalls to be able to use my application so
> I need to know on what ports I can transmit my audio to the user (via UDP)
> so that if he/she is behind a firewall, the audio will be received.
>
> Thanks a MILLION in advance,
>
> Ahmed
>
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Hi Ahmed,
No firewall is going to allow you by default to just get directly at it's
internal network. In a lot of cases, the firewall uses NAT (network address
translation) so the outside world never knows what hosts are on the inside
and for this reason, these types of connections are usually initiated from
an internal host using some sort of gateway or proxy which is setup by
the firewall admin for that particular service or via a generic or TCP relay
from the firewall's external interface to an internal host
PS: port scans are also not a good idea ;-)
Regards,
--
Marko Vukovic' E-mail: [EMAIL PROTECTED]
Technical Support, WWW: http://www.cequrux.com
CEQURUX Technologies Phone: +27(21)423-6065
Firewalls/VPN Specialists Fax: +27(21)424-3656
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