Internet connections are notorious for having slow upstream bandwidth, which is the important one if you're running a server.
You might have 2Mbps downstream but only 256kbps upstream, which means an absolute limit of 25 KB of information being sent out to your connecting clients per second. That may not be enough for EQ to run.
Hard to say without knowing your actual numbers, though.
They are able to log in? It's just when zoning?
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