Ichat Port Restricted Problem

Question

I just installed OSX 10.7.4 on an iMac.  I am now getting a router error when setting up iChat.  I get the "Port Restricted" message and find that I m not getting any incoming communications.  I have found a help screen which explains(??) what is happening.  I am not the greatest IT guru and am lost in the explanatioon.  Can anyone point me to a beginners manual about the problem, and more importantly - how to fix it!!
Thanks

Answer 1

OK
Here's the page of info.
The Network Status pane of the Connection Doctor window displays information about
your bandwidth setting and network router type. Both of these attributes influence
your ability to establish and maintain connections during audio, video, and screen
sharing chats.
Bandwidth limitation: Indicates whether the bandwidth (data transfer rate) has been
limited to a particular speed in iChat Audio/Video preferences. If the indicator is
green, no limit has been set. If the indicator is yellow, click Settings to view and
optionally change the limit setting in Audio/Video preferences, using the “Bandwidth
limit” pop-up menu.
Router type: Identifies the kind of network address translation (NAT) router your
computer is using to communicate with other devices using the Internet.
A NAT router lets you use one Internet connection to connect multiple computers or
network devices to the Internet using a single public IPv4 address. Typically, the NAT
router assigns private IPv4 addresses to the connected devices. When a computer
sends outgoing packets, the NAT router translates (or “maps”) the packets’ private IPv4
address and port to an address and port that can be used for replies.
If the router type you see in the Network Status pane is Full Cone, your network setup
is compatible with audio and video chatting. If the router is some other type, your
network setup may be causing connection difficulties. Here are the NAT router types
you may see in your Network Status pane:
Full Cone: Anyone on the Internet can send replies to the computer by using the
translated address and port. If either the sender or recipient uses a full cone port, the
connection should succeed.
Restricted: The router associates the translated address and port with a particular
destination address. Replies from other addresses are filtered out.
Port Restricted: The router associates the translated address and port with a particular
destination address and port. Replies from other addresses and ports are filtered out.
Symmetric: The router associates the translated address and port with a particular
destination address and port, but uses a new translated port for each destination
address and port.
Unknown: The type of router couldn’t be determined.
Network Status pane of Connection Doctor
This last sntence about the router not known appeared after I redid the Netgear "Routerlogin program"  So I did do something but nothing changed in the iChat program.