Screen Sharing in iChat stopped working

To begin with, I have iChat 4.0.3 but I do not see any categories for that version.
The screen sharing feature in iChat was a really great tool that allowed me assist my family from remote locations to help them trouble shoot issues on their Macs. This feature mysteriously stopped working after the release of the 10.5.3 Mac OS X update. Prior to that, the feature worked perfectly and was able to connect each and everytime after all the proper settings were configured correctly at each end. Now, the feature does not work at all in iChat. I have confirmed and I am able to use the screen sharing features in "Back to my Mac" so I can still screen share with my desktop at home when traveling using my laptop, but I cannot screen share trying to connect using iChat. I have double checked the proper settings for sharing and those are good, I have double checked the settings in Quick Time preferences and those are set to 1.5 Mbps T1 as suggested. I have also gone back and applied the 10.5.3 combo update to both my laptop and the iMac that I am trying to connect to. The router settings have all been verified and the ports are open. The firewalls are all set and both allow connections using iChat, File Sharing, and Remote Log In. Still, after all of this, the screen sharing feature in iChat will not connect and results in a timeout error after about 15 seconds. Is this a known bug in 10.5.3 and can I expect some relief in the next update? Are there any other tricks that may be applied? This is a feature I relied on pretty heavily and now it is gone. Thanks in advance for any assistance.
I have read several posts regarding the issue of screen sharing in iChat not working properly and I have tried every solution offered in those threads and none of them have worked for me.

Upon further testing with a different iMac user I was finally able to determine that the problem is router related. I am going to go back again and double check the port settings to make sure they are configured correctly. The router that is giving the problems is a Linksys router and the router that tested fine is an Apple Airport Extreme router. I suspect the LInksys router probably needs to be tweaked further to get it to work properly.

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