Hi,
Your router (or modem that routes) may offer several different ways to open or allow ports to be used.
You would normally access the set up pages of the router in a web browser (Except for Apple Base Stations)
This requires the IP of the router and the User Name and Password info.
The IP can be seen in System Preferences > Network > Advanced Button > TCP/IP tab (As "Router IP")
The default info on the User ID and Password can be gained here
Click on your device.
Dismiss the next page at the top right
Chose an App in the next page (If iChat does not work chose AIM Talk as it has less ports and gets you to the next page)
On the next page you have to scroll a bit.
When the pics start it will tell you the default User Id And Passwords along with the IP address
It is now a question of searching all the tabs, menu and links on each page to find UPnP as it is in different places on different devices (if it is there at all)
Netgears tend to always have a menu down the left and UPnP is nearer the bottom as a separate menu item.
Linksys devices have it in the tab called Administration
D-Links tend to need Tools or Advanced across the tabs and Advance Networking down the menu buttons
Zyxels have a three column menu of links and it is at the bottom of the middle row.
Netopias and Motorolas don''t have UPnP
Port Forwarding tend to be easier to spot and the Port Forward link page will show you as well.
This is normally a table of ports and a listing of an IP that they are being sent to. (this should be the IP of the computer)
It can list Start and End ports (you list the same for single ports)
Sometimes they follow a setting such as 5190,5678,16384-16402 where single ports and groups are mixed (Commas and dashes only no spaces)
There may also be a a check box for Enabled.
You may also get a choice for Port Triggering (Advanced/Special Applications) which allows multiple computers to use the same ports.
DMZ (Demilitarised Zone) is a sort of extreme Port Forwarding. It is an On Off setting that allows All 65535 ports to be open to one IP (Computer) Useful for testing but lacks security.
Like a Web Browser, iChat and Face time use IP addresses to connect to the Buddy.
It helps if the DNS server info is working.
Some DNS servers are better at wider address areas so adding other DNS servers like that thread can help.
If you are now working it is likely that the router is already doing UPnP.
9:42 PM Friday; June 10, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb( 10.6.7)
Mac OS X (10.6.7),
"Limit the Logs to the Bits above Binary Images." No, Seriously