Here is an update to my situation now that I have tried a few things.  If I am 
reading this correctly, Apple’s Messages app does NOT do screen sharing or 
video sharing on its own iMessage platform.  If you request video sharing, that 
is handed off to the FaceTime app.  If you have a jabber, AIM, or Google Talk 
account configured and active, you can screen chat and video chat within the 
messages app.

I am an arse because I assumed that when I clicked either the video chat or the 
screen chat icon in messages, I was using Apple’s iMessage service to make the 
connection.  It turns out that I was actually initiating the use of Google 
Talk.  So that got me thinking.  I put both client computers on the same 
network and opened the FaceTime app on both.  Called each other and they both 
worked great.  I then put a client on the pf network and tried again.  They 
both worked as well, hmmm.  I put the 2 clients back on the same network, 
disabled iMessage, and tried to do video chat which defaulted to use Google 
Talk, that worked as expected.

Now, back to the pf box, I have 3 interfaces, WAN, LAN, and GUEST.  If I put 
one client on Lan and the other on Guest, the FaceTime app connects properly as 
you were reporting.  That does not allow me to do screen sharing since FaceTime 
uses the iMessage transport and does not support screen sharing.  Having both 
clients on the LAN interface using Messages with  Google Talk does work as 
hoped.  What does not work is Google Talk with one client on LAN and the other 
client on GUEST, which effectively created the same problem as I initially 
requested assistance for.

So now I am off to see what Google Talk is doing during the handshake that 
causes it to fail between interfaces on the pf box.  What logs would indicate 
what is being blocked?

Thanks for your time.

Paul Galati
[email protected]



On Jan 14, 2014, at 3:01 PM, Paul Galati <[email protected]> wrote:

> I have tried searching the forums for find a fix to allow Apple Messages app 
> to successfully connect using Audio, Video, or Screen Sharing.  Unfortunately 
> I have not found a solution.  It seems the port number is different each time 
> I view the logs.  Has anyone been able to resolve this or similar issue?  The 
> initial connection does work (ringing the bell) but when I accept the invite, 
> it fails to start the actual stream.  I am using the Jabber protocol with 
> gmail since both parties have gmail accounts.
> 
> Is it possible to temporarily create a DMZ to a specific private IP address 
> to allow the service to connect and view  the logs to understand what ports 
> are needed to make this work safely.
> 
> Any suggestions would be greatly appreciated.

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