There are various reasons...
You have to take a port over 1024 since on *nix OS they are reserved for root.
Probably the provider firewalled you, that would mean -> gg.
Maybe the mac internal firewall is still active, you're save to disable it at all, since
the router you own firewalls all ports you don't make exception rules for anyway.
And it's a mac, and mac users think they're safe in general... so turn the macs firewall off!
PS:
Ozza you phail!
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