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Another possible iChat fix for connection issues Apps
I have been having problems with iChat for many months now. Not responding, or the other person not responding, and all of that nonsense when trying to do an audio or video chat. Sometimes the chats would work, most of the time they didn't. My setup is like this: A phone line to a DLink 302g modem to an AirPort Extreme base station, and finally, out to my PowerBook running 10.4.6.

The latest fix that I have tried, which seems to have worked so far, is to put the modem into "bridged" mode. I then connect to the ISP via 'Connect via PPPoE' under the Internet tab of the Airport Admin application -- add your ISP username and password in the appropriate boxes.

Hope this helps! I have been through the previous 212 iChat hints, and I don't think I came across a similar hint.
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Another possible iChat fix for connection issues
Authored by: Arendtww on May 18, '06 01:20:12PM

I had the same problem with iChat. The resolution was the same, but with a Broadxent ADSL Gateway Briteport 8120. The modem router must be set up as a bridge. The rest of the setup is the same using Airport Extreme base station. If you cannot obtain the username and password for the Briteport, you will find them in the config file for the modem/router. One more important element, in our case, is in the Airport Admin Utility - Configuration - Network, check the Distribute IP addresses box and the appropriate share an IP or IP addresses box.

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Another possible iChat fix for connection issues
Authored by: Sorcerer8605 on Jun 01, '08 05:15:37PM

Yes, you are correct. If you use bridge mode for your AirPort base station, you shouldn't have problems with iChat screen sharing, or any other screen sharing for that matter, assuming that you allow the services in your software firewall (the one in your Leopard preferences). Likewise, the person on the other end has to do the same.

If you use IP sharing on your AirPort, you run into problems because this mode turns on the built-in AirPort "firewall," or NAT, which is really just a method of hiding you from the outside world. If you want to share an IP, you have to make sure you set it up as a "DMZ" (demilitarized zone) connection, which opens up your main computer to everything (effectively turning off the "firewall" used by IP sharing mode). Or you could simply forward the iChat screen sharing port, under Port Forwarding. In your AirPort Utility, select your base station, click "Manual Setup," and then go to the "Advanced" tab and click on Port Forwarding. Use 5900 as the port for both port boxes, and use the local IP address for your computer (the one that shows up in your "Network" preferences pane in Leopard; you might have to set up everything BUT port forwarding first, in order to know what your IP is, unless you know how to set up your IPs manually, which I won't go into). Suffice it to say, though, there IS a way to use IP sharing and still use iChat's screen sharing service. :-)

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