Messages, cannot do video chat/screen sharing

Question

I have a Arris TG862 router, I tried the port forwarding from 80 to 16403, before this on CONNECTION DOCTOR, it said on "router type : port restriced" but now after I did the port forwarding, it says FULL CONE. but I still cannot do video chat or screen sharing ...the other person who I'm trying to connect also did the port forwarding as me.
what else can i do?
Thank you!!

Answer 1

Hi,
Which Account are you trying to Screen Share with ?
An AIM to AIM connection or a Jabber to Jabber connection will use random ports for the Screen "Video" part.
Only the Audio Only chat that is along side that is on port  16402.
Basically this In-App Screen Sharing that has been there since iChat 3 uses the Apple Remote Desktop engine to do the Screen Sharing but make a  VNC connection along side the Audio only chat.
In Yosemite the iMessages account can invoke the Screen Sharing App itself (You need to Enable System Preferences > Sharing > Screen Sharing for this).
This also uses the Apple Remote Desktop engine but in an App that is tucked away in System/Library/Core Services/Applications.
In the System Preferences > Sharing you cannot have Remote Management and Screen Sharing enabled at the same time  (They both use the Apple Remote Desktop App/Engine).
If you router can us UPnP you may find it easier to use that.
This allows the apps (computer) to tell the router which ports to open and on most devices they close after a period of non use.
On some you can also set how far ways devices can see the UPnP (Hops) and also alter the delay until the ports close after non use.
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