Hmm...
I don't use a mac (won't support apple, ever). But I digress--IP address being blocked means the server thinks you've got a toon in the world. It does this to prevent boxing, and usually expires within 30-60 seconds allowing you to log in again. In rare occasions I've had it last upto 5 minutes, but that's pretty rare.
Have you ever been able to play EQ on a mac?
If not, you might find this link helpful (although it's a bit old)
http://forums.station.sony.com/eq/po...topic_id=17405