Video chats - sometimes works, most of the time does not

98% of the time i either invite a buddy to video chat, or they invite me, we get an error message stating that the invitation was declined, or some other communication error. 2% of the time i can successfully video chat. i am confused as to why it works sometimes, and not others.
i've read countless stories of similar situations in these pages, and have attempted all of the recommendations, none of which have improved the situation.
comcast high speed cable is my ISP, and we use a netgear router. the problem ocurrs regardless of whether my mac is hardwired or using airport.
any help is appreciated.

The Mac Firewall in Leopard has three settings
Allow All which is effectively Off
Allow Essentials which allows certain prescribed services only.
And Allow Specific Applications and Services. You need to add whichever things you want to work with the internet by application or service even if it uses a port you know is used by something else.
For instance - If you had iChat and AdiumX both of which log on to the AIM servers on port 5190 by default you have to allow both apps in the Specific Section list (the same if you change their Login ports both to 443
Now there seems to have been a problem at the OS 10.5 to 10.5.1 change over.
It seems that the OS is holding on to the 10.5 setting (which in fact may not be working at all)
Therefore use the - sign at the bottom of the list to remove any item that was there before the 10.5.1 update and then set the firewall to Allow All and then set it back again and use the + sign to re-add applications.
The Firewall will work on whichever connection the Mac has to the next device in line, towards the internet.
Thanks for the points
7:23 PM Tuesday; December 18, 2007

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Thanks for the points
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Video chats - sometimes works, most of the time does not

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