Re: FTP transmission issue

This sounds just like what I'm encountering...


"noone" <noone@xxxxxxxxxxx> wrote in message
news:uS8TRFChGHA.2208@xxxxxxxxxxxxxxxxxxxxxxx
If this is a Firewall issue, then why are there any file transfers allowed
at all. If the Firewall is not configured to allow access on the
undefined port, then it should deny access entirely, not after a half
dozen files get transfered... ????

Firewalls are just that... walls. They stop access in, or out, defined
by the user. Is there some magic I'm missing here...?

:-)



"Robin Walker [MVP]" <rdhw@xxxxxxxxx> wrote in message
news:%23y4gWoAhGHA.3496@xxxxxxxxxxxxxxxxxxxxxxx
noone <noone@xxxxxxxxxxx> wrote:

The problem is that the FTP going out from the server will work for a
certain time then will fail pushing files.

Here is how it happens:

From the DOS prompt of the server

Please clarify this: you are using the ftp *client* program on your IIS
server?
So this query has nothing to do with IIS?

ftp (IPaddress)

What is it that you are connecting *to* here? Someone else's remote FTP
server, or what?

You can do the put a few times and eventually after 4 or 5 attempts
it will fail.

On a second site it does the same...

What do you mean by "second site"?
Do you mean:
(a) the same ftp client connecting to a different remote server?
(b) an ftp client at a different site connecting to the same remote
server?

Sometimes it will work for hours and when it blocks it takes many
attempts to let a few files across then blocks again.

I'm running a Brand new box Dell PowerEdge 1850, dual processors, 4
Gb ram and 140 GB Hdd, with Windows Server 2003 R2 SP1 and IIS 6.0.

What is the relevance of this information if you are not using this IIS,
but just using an ftp client program?

The local Windows firewall is not enabled and the box is sitting
behind a corporate firewall. Port 21 is enabled OUT for everyone on
the firewall, with no restriction.

If you are using the ftp line-mode client built into Windows, then it
will be functioning in Active (PORT) mode. Only the command stream uses
port 21 on the remote server. The data transfers will be made on a
connection *from* the remote server *to* your ftp client: that is, an
incoming connection through your firewall, even though you are PUTting
data from the client to the remote server, the TCP connection on which
this happens was made the other way around. Your firewall might not be
happy with this, or might be timing these connections out.

I suggest that it is all a firewall problem.

You might care to do some experiments with alternative third-party ftp
clients that can use passive mode FTP, to see whether they work better.
That assumes that your firewall will let the passive mode connections
out.

--
Robin Walker [MVP Networking]
rdhw@xxxxxxxxx





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