Video works with one friend but not another?? please HELP!

my ichat video isn't connecting with my friend christina. we've taken turns calling each other and my computer keeps saying "no data has been received in 10 seconds" i can hear the ringing and then when we go to connect thats when the message comes up and cancels the call. at the same exact time my other friend sam was online so to test out my video chat i called her. & it worked. christina also connected with sam separately & that worked. then we tried a conference where all 3 of us could chat, and sam started it and invited both of us. it worked and we could all talk & see each other. however for some reason i can't connect to just christina. what's going on?

Hi,
Welcome to the  Discussions
iChat can have several messages on a failed chat.
The "No Data for 10 Secs" one only appears on chats that connect (even if you don't see the Video)
Basically it point to an issues between iChat at the Internet.
The same Result can be achieved by pulling the Ethernet cable out or turning the Airport card off or powering down the modem or router.
So we have to look at what can produce a similar break in the Internet connection without the drastic steps above.
Some modem and router have "protection" features that will do this.
Denial of Service (DoS) tries to make sure any data that come to your Computer does so at a rate it can handle.
It was originally designed to protect Web Servers from "attacks" where too many requests coming to frequently used to bring servers and their Internet connections to halt.
So Dos is threshold based,. It will cut any port that it thinks there is an "Attack" on.
Video chats can send lots of data.
These thresholds that are preset in the device tend to be set at Web page streaming speeds (allowing for multiple requests on popular servers) - but also at older Internet Speeds.
Modern Speeds and things like iChat Streaming two way Video can mean that certain Buddies can send you data faster than the threshold is set for particularly with iChat 5.
Stateful Packet Inspection (SPI) works differently but can only process a certain amount of data and will cut the port that is causing it to be overloaded making it Threshold based as well.
There is no way to change the thresholds involved so the best course of action is to Disable the feature.
So the Speed Sam has to send you Video may be lower than that of Christine and not bump into the threshold.
If Sam is the Host then it the Speed of that Internet Connection that governs how fast Data is sent to you.
One solution is to cap iChat in iChat > Preferences > Audio/Video Menu to 500kbps on the all Buddies involved.
If this solve the issue between you and Christine then you can move on to your Modem or router.
8:16 PM Sunday; June 6, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
Message was edited by: Ralph Johns (UK)

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