Screen Sharing - Unable to use with some users - Version 4.0.8 (619)

Hello,
I got my mom, who is disabled, a year ago an iMac especially because we're not living on the same city and I wanted to be able to help here when problems occurs.
iChat was a great solution but I could never work it out. With some of my friends Screen sharing is working fine, with some not and I could never find a reason why.
I contact apple long time ago, no one answered.
I've don all Port forwarding on our both computer following the instructions here:
http://portforward.com/english/routers/port_forwarding/Edimax/BR-6104K/iChat.htm
I thought if I can connect to others, than that means all my setting are correct.
Still, even though my mom got the same setting and can chat+video with her, I'm unable to do the screen sharing.
I find it very very frustrating.
thank you very much
shlomit

Hi,
The Port Forwarding shown on the Port Forwarding site does include all the ports iChat 3 uses as listed here http://support.apple.com/kb/HT1507
These include port 5060 that iChat 4 does not use and an extended range of A/V ports (20 as opposed to 10 by iChat 4).
However the iChat 4 range of A/V Ports is inside the ichat 3 range so they will work.
What this second Article does not tell you is the iChat Sharing port.
Testing has shown us that this port (which runs along side an Audio Chat) is random.
It seems that for most people this means using UPnP.
I see from the pica at the link you posted your Device has UPnP
I would use that (Disable the Port Forwarding).
Depending on the speed of your Internet Connection you may have to turn Off the DoS setting particularly if your Buddies are on a fast connection and can send you lots of data in Video Chat.
It may also pay to set your Mom's modem/router to do UPnP
7:31 PM Sunday; May 31, 2009
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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