[Ti] iChat v Yahoo! Messenger

[Alan Thompson]

Perhaps iChat does not "protocol hop" like the Yahoo! IM client does.  
It's really difficult to block IM on your network - you can't simply 
block outgoing traffic on the popular IM UDP ports - the clients will 
try to just use another port, most likely port 80 - which is typically 
open for web traffic.  Perhaps iChat will not try to do this, and will 
only try to communicated on specific designated ports?  Do you use a 
proxy server for anything while you are in Saudi?


On Apr 20, 2005, at 6:27 PM, Dr. Trevor J. Hutley wrote:

>
> I have never been able to get iChat to work from here in Saudi Arabia. 
>  The moment I return to Switzerland and connect via ADSL, it works 
> perfectly.  I had assumed that it was some nation-wide configuration 
> restriction here to prevent chatting.
>
> My PC-user-friend stopped by this afternoon, and asked if I had Yahoo! 
> Messenger, as he wanted to use my dialup to exchange some messages.  
> So I quickly downloaded Yahoo! Messnger for OS X, launched it, and it 
> worked straight away..........
>
> So what could be the explanation for this?
> What is it that iChat does so differently to Yahoo! that it does not 
> work?
>
> Does anyone have any idea about the workings of iChat and Yahoo! 
> Messenger, that could explain this unexpected result?
>
> regards,  Trevor
>
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