Screen Sharing Doesn't Work

Hi!
I am having problems getting screen sharing to work. When starting a session I get an error message saying iChat is unable to start screen sharing.
Using the same computer with the same settings I can connect to some systems, but most systems won't allow me to connect.
In all cases, Enable Screen Sharing is checked. All systems are running iChat 4.x. All systems are running the same operating system. All systems are connected via hard-wire Ethernet.
What do I need to do to get iChat screen sharing to work? Connection Doctor does not show any results until AFTER a session has started.
We are able to connect via messaging with no problems.
Thanks,
Larry

Hi,
Welcome to the  Discussions
The Connection Doctor gives a shortened form of the Error message.
The Pop up (Send to Apple) has a Reveal Triangle next to the word Details.
In here will be a Longer Log with the Error code number at the end of the first main paragraph.
The Main issue with Screen Sharing is that it uses a Random port.
iChat uses 20 ports at iChat 4 and 5
Port 5190
On TCP (to Login to AIM) and to Plain IMs and ON UDP to send Direct IMs including File Sending and Pics in Chats.
Some modems and routers cannot handle this dual use and we suggest changing the Login port to 443 (it helps with some Logging in issues and some Video chats)
Ports 5220, 5222, 5223 on TCP for Jabber and GoogleTalk Buddy Lists.
Ports 5297, 5298, 5353 on UDP and 5298 on TCP for Bonjour Buddy Lists.
Ports 5678 On UDP for Sending/Receiving the Visible Invite to A/V chats
Ports 16393-16402 On UDP (Ten Ports)
(iChat 2 and 3 uses a wider range of ports (2) that can be read here which is where the Jabber and Bonjour ports are listed)
See this Article for iChat 4 up which only lists the changes to the A/V ports
You will notice that the later Article does not mention Screen Sharing.
This tends to mean you cannot "Set" the port in Port Forwarding due to it's random nature.
This may mean your Buddies do not have the port "open" for it.
Using UPnP which gives control to the App about which ports (and when) are opened.
There is also and Issue in Leopard with iChat 4.x with Internet Sharing (System Preferences > Sharing).
This can not be On. It effects all chats that involve A/V, which includes the Audio Chat with Screen Sharing.
9:31 PM Monday; October 26, 2009
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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Message was edited by: Wayne

Thanks again Leo for your help,
Yes I was refering to the screen sharing in system preferences/sharing.
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*edit*
Just a thought, would the type of account make a difference? At the moment we are both using the type of accounts that iChat creates when you select "get an iChat account" (creates a [email protected] login)
Message was edited by: Wayno

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Hello Roossx2,
Thanks for using Apple Support Communities.
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http://support.apple.com/kb/TS2972
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Hello everyone!
I can tell you fantstic problem. Sorry for my English - i'm from Russia!
The problem:
1. Share Wi-Fi via bonjour to other devices such as iPad, iPhone, windows computers, etc. I'm using Mac os X Snow Leopard! Everything is fine!
2. Just only I plugging hdmi/dvi adapter - INTERNET STOPS TO WORK!!!
It looks like fantastic. If just I plugging-off remote monitor! Internet works fine! If only turn on! - It doesn't work!
Can You only believe???
When you plug remote monitor or plasma TV via mini display port - Wi-Fi sharing is not working!!!
I try to solwe this problem about 1 year - and found this forum. Nobody on internet ask this question!!!
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But it strange - why nobody in internet ask this question!
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Имя процессора:          Intel Core 2 Duo
Скорость процессора:          2.4 ГГц
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UUID аппаратного обеспечения:          FB8005A6-CA65-55AE-8695-49DDA4825BD9
Сенсор внезапного движения:
Состояние:          Включен
Snow Leopard !!!

Yes, I actually checked that it was 7.1.2 Not sure when they released it, but I had been trying to get this to work all last night.
But I did try something new...I had set restrictions for my son in Settings. If I turn "off" all restrictions, the app will load properly and bring me to Netflix sign in.
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