"Robin Walker [MVP]" wrote:

> cyberduane <cyberduane@discussions.microsoft.com> wrote:
>
> > I am running IIS 5.1 on Windows XP Pro SP2.
> >
> > When trying to access my FTP site, I get the error message indicated
> > by this screen: http://northoftheneck.com/ServerIssues/FTPerror.htm
> >
> > I have captured my FTP site settings in the following files:
> > http://northoftheneck.com/ServerIssues/FTPerror2.htm
> > http://northoftheneck.com/ServerIssues/FTPerror3.htm
> > http://northoftheneck.com/ServerIssues/FTPerror4.htm
> > http://northoftheneck.com/ServerIssues/FTPerror5.htm
> >
> > Any clues to help me resolve this error will be appreciated.
>
> Your FTP server appears to be behind a NAT router. IIS issues the wrong
> server IP address in PASV mode requests (its internal LAN address instead of
> the WAN address of the router). Short of getting a NAT router which can
> handle PASV-mode command re-writing on the fly, you will not get PASV-mode
> to work with IIS behind a NAT router.
>
> You can try other FTP servers, which support PASV-mode behind NAT routers.
>
> --
> Robin Walker [MVP Networking]
> rdhw@cam.ac.uk
>
>