Re: Multiple FTP sites problem
- From: "Robin Walker [MVP]" <rdhw@xxxxxxxxx>
- Date: Fri, 9 Jun 2006 10:29:10 +0100
Elie Grouchko <elie@xxxxxxxxxxx> wrote:
I tried to setup the following configuration of 2 FTP sites:
1. Default FTP site, port 21, no user isolation, read + write.
2. 2nd FTP site (same IP as the first), port 7721, users isolated (no
AD), read only.
The second site returns an error (from the Windows explorer) when I
try to access it
The error I get is:
500 Invalid PORT Command
If I shutdown the first site, and change the port of the second site
to 21, it works fine, so I assume it has to do with the port number.
You dont'say, but I'm guessing that your FTP client is running behind a NAT
router. NAT routers at the client end cannot handle Active Mode FTP
correctly unless they specially recognise it, and they recognise an FTP
connection by a TCP connection being made to remote port 21. Therefore
client-side NAT routers fail to handle Active Mode FTP conenctions to ports
other than 21.
This is not an FTP server issue. It is an issue with the NAT box at the
client end in particular, and an issue with the FTP protocol in general.
--
Robin Walker [MVP Networking]
rdhw@xxxxxxxxx
.
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