NO FTP from clients behind Routing and Remote Access NAT

I have a feeling I'm just overlooking the obvious, but this is driving
me nuts.

Clients on a Windows Server 2003 R2 Domain cannot connect to FTP
sites. The server itself CAN.

Server is 2003R2 64bit, running 2 nics with Routing and Remote Access.
Basic Firewall is off.

When any machine behind the NAT tries to access any FTP site I get
"Connection closed by remote host."

I have done some digging and if I run the command "netsh routing ip
nat delete ftp" then I have slightly more communication. At this point
I am able to log in, go through user name and password, but when I try
to do a directory listing, it hangs, until the connection drops.

Any help is appreciated.

Do you know if it's using active or passive FTP? If you can find a site the
you know uses passive, you might want to see what sort of luck you have in
that case. Active FTP requires that some unsolicited connections are made
back to the client, so I am not sure what you would need to do in RRAS to
allow this. Also, does RRAS have a built-in filter for FTP? I don't believe
it does. I'm not too familiar with RRAS alone as a solution. I use ISA so I
can't be of much help beyond this.

I have tried using CuteFTP in PASV mode, I cannot successfully create
a connection to the domain controller running IIS. The domain
controller is also the gateway. A Windows Server 2003 R2 64 bit Intel
whitebox server. I AM, however, able to set up an ftp server on
another client inside the network and access THAT machine from another
client in the network, so I know the network hardward isn't limiting
it.

I have ruled out everything except the 2003 box, this is my first
experience with an x64 server, and I've already seen that IIS must be
running in 64 bit mode to support exchange 2007, but that should have
no bearing on routing and remote access acting as a gateway on the
network.

So I am left not being able to not successfully connect to any FTP
server outside of the network, OR the gateway itself.

Is there a possibility of the Intel Management software running on the
mainboard and feeding to the NICs having anything to do with this?

dwadles,
Did you happen to find a solution to your RRAS issue? I too find myself in a similar predicament. All my workstations fail to access legitimate FTP servers but my server (the one running RRAS) can access them. I know there is filtering on the RRAS NAT/Basic Firewall settings but I'm not sure which will allow all outbound FTP traffic. If I find something I'll post it.

Were you able to solve the problem?

We're having the same issue. Would welcome any advice.

Thanks.