IIS 6 Passive FTP Returns Private IP Address

I am trying to use passive FTP on IIS but am having some connectivity issues.

If I look at the traffic with Wireshark I can see that when the FTP server returns the client the ports to use it is returning it's private IP address instead of the public address.

I have seen this before but on later versions of IIS I can specify the public IP address for passive connections. Is there any way I can do this on IIS6 ?
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SommerblinkConnect With a Mentor Commented:
IIS6 does not support NAT'd passive FTP communications.

Two choices, upgrade from IIS6 or use a firewall which can modify the PASV response packet.
Or there is a third option - if have a decent amount of public IP space, you can carve out a subnet and assign that to your server.

It can still be protected by a firewall... public addresses are no different than private addresses, in this regard.
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