"Rend Error" when sending image via iChat/AIM

Question

On my brand new iMac aluminum, I am unable to send, and friends are unable to send, images via iChat AIM 3.1.8 (V445). When either of us try to send, we get the message "An undefined AIM error has occured. The server message was: Rend: Error"
I then spin around and use my old G4 iMac to send an image - no problem. My buddy is also able to send to me, no problem.
Both computers are connected to the same Linksys WRT54G router. When I searched for the term 'rend' only one thread came back which suggested to change the port from 5190 to 443. I did this and it didn't help.
Any other suggestions?

Answer 1

Hi Craig,
In the Linksys set up pages you have Application and Gaming (Which is where I think you are talking about)
In there there are several options.
Port Forwarding, Port Triggering, DMZ (possibly UPnP Forwarding and QoS)
Disable any Port Forwarding or Port Triggering. DO not use the DMZ.
Save settings. (you should still have Web browsing and Mail abilities).
GO to the Administration tab on the top row.
Enable UPnP.
Save Settings.
UPnP allows multiple computers to use the same ports.
This way the Linksys can be left doing DHCP if you wish and it will not matter if your computer gets a new IP every now and then. Also the Ports are opened by the application and close after a timed period of non use.
You can limit the "Hops" to the number of devices the computer is from the Linksys (1 ?) to make it more secure.
On the main set up page you could limit the the DHCP range to the number of computers you have to prevent outside connections.
The ports you describe so far are only the TExt chatting and file sending ports
11:23 AM Monday; August 13, 2007