How to deploy a distributed visibroker based-application ?

Hell,
I have build a collaborative video application that allows physicians to work remotely, at the same time and together on medical video files preliminary replicated on each site.
To initiate a collaborative session, an application, called supervisor, is run on a computer with a well-known IP adress. Then, each remote user must connect it client application (collaborative video player) to the supervisor one by filling the IP adress of the computer running the supervisor application. The aim of the supervisor aplication is to receive messages that encode user action, and to redistribute these messages to all other client applications that will be updated indentically (state consistency must be maintained).
Both client and supervisor application have benn developped using Java and the Visibroker 4.5 Corba ORB has been used for communications between remote applications.
All the tests we made on a local nework were successful. However, we have big problem to use this distributed application if the computers running the supervisor and the client applications are connected through the Internet and not through the same local network.
If you are familiar with Visibroker, you may know that a daemon, named Smart Agent must be run so that remote objects can be seen. This daemon works well on a local network but how can we use it through the Internet ???
The visibroker documentation mentionned that a command instruction allows to mentionned the IP adress of the computer running the smart agent (.... -Dvbroker.agent.addr= 125. ...) and even on which port the smart agent is listening to. We have tried this withourt success !!!
So, I don't know what to do now. That is the reason why I post this message to this forum. I really hope that someone would help me to solve this problem.
Thank you very much per advance.
With my best regards.
Yannick.

By default, the visibroker orb performs resolve_initial_references using multicast, which (depending on your network configuration) will not be routed outside the local subnet. You should be able to connect to the visibroker smart agent on another network by supplying the following options to the client application -Dvbroker.agent.addr=<address of machine running smart agent> -Dvbroker.agent.port=<smart agent port> -DSVCnameroot=NameService (as long as you have started the naming service with the name NameService). This assumes you are using the visibroker orb on the client. If you are using an applet, the usual security restrictions apply. If you have to go through a firewall, ensure it is configured to let IIOP traffic through or I think you may be able to configure visibroker to use HTTP tunneling.

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