Filipe Brandenburger wrote:
On Thu, Jun 5, 2008 at 2:05 PM, Timothy Selivanow
<timothy.selivanow@xxxxxxxxxxxxxxxxxx> wrote:
things like 'put' and 'get', etc.), the connection hangs. If you wait a
bit it returns with a "425 Failed to establish connection". I've tried
Is the FTP client behind NAT? If it is then active FTP won't work,
since the client will request the server to connect to the internal
IP.
its somewhat more complex than that. many NAT boxes (home routers,
etc) recognize FTP on port 21, and monitor the PORT commands, and mangle
them automatically. A linux masquerading server can do this too, with
the right ip_masq module. if the FTP is running on a nonstandard
port other than 21, the automagic stuff won't work. If the FTP
/server/ is behind NAT using a port forward, it also gets messy.
there's a detailed discussion of these and other salient points here,
http://www.ncftp.com/ncftpd/doc/misc/ftp_and_firewalls.html it bears
reading carefully.
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