I must stress, I AM NOT RESTRICTED in any way. I know this because of the following reasons:
a.) I e-mailed blizzard tech support last week when I began having this problem and provided my IP address. I was told at that time there is no restriction on my IP address.
b.) I have a windows based laptop next to me that I am able to connect with no modification to the computer's network settings, or the router setup directly.
For arguments sake I have tried the troubleshooting listed on the support page. The most important info (I feel) is listed below.
1. I am logged in as administrator
2. I have tried to connect with and without the mac firewall activated and the diablo program allowed.
3. I am able to connect from a windows based machine with no modification to it, or my network.
I am new to macintosh, so I don't know what else to try. I appreciate any assistance.