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Desktop video through 2 ISA servers

Last Modified: 2013-04-25
I’ve been trying to get a desktop video conferencing system working here but have encountered a bit of a brick wall and I’m hoping you may be able to help.

We use two firewalls, both MS ISA Servers, one (ISA2004)as a back-end firewall and web proxy, the other(TMG) as a front-end firewall and to publish services.  Normally, we would place a given service like our web sites on a 192.168.x.x segment and use NAT on the front-end firewall to handle the routing between an incoming request and the serving of a web page or facility.  Similarly for FTP and other services.

When it comes to this VC Desktop, we have had no problems in installing the software and making suitable firewall rules to connect outwards (UDP 5082) but our front-end firewall insists on blocking the returning signal as it is returned to the firewall external address with no indicator which would enable it to route to the correct internal address.  We are also not ‘publishing’ a server in the classic sense as this is more of a pass-though issue.  We will need users behind the back-end firewall to be able to use this service.

We should perhaps be using secondary ports but we are unclear as to how and what to configure.

Ita may well be that we have completely the wrong approach so any help v gratefully received
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