Re: Timeout error when using FTP from Windows DOS prompt
From: Alun Jones [MSFT] (alunj_at_online.microsoft.com)
Date: 10/12/04
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Date: Tue, 12 Oct 2004 16:17:59 -0700
"Eli Tucker" <eli-msdn@mailinator.com> wrote in message
news:O3hVN5JsEHA.2340@TK2MSFTNGP11.phx.gbl...
> I'm trying to download 253 files. Depending on the client machine and
> network that I try to transfer from, 4 to over 50 files are transferred
> successfully before the error.
I've seen it happen with a very few files in the case that the client is
behind a NAT router. Those devices can often have an even more restrictive
number of ports open for ephemeral connections by FTP clients, and they are
very often not configurable for more.
> You stated that the windows command line FTP client uses active mode to
> transfer files, and perhaps this is the root of the problem. I'm trying
to
> transfer a SQL Server snapshot (just a set of files) using SQL Server
MSDE,
> and it uses FTP to transfer files. It appears to be using active FTP
mode,
> but I suppose asking about using passive mode is a question for the SQL
> Server group.
Absolutely spot on. I wouldn't be too surprised if there were some SQL
experts here, but it would only be by coincidence, rather than design.
> You mention that one of the solutions would be to have the client
"increase
> the range of ephemeral ports alloted by the client (this may be difficult
if
> the client is behind a restrictive firewall or NAT)". How would one go
> about doing this?
Sorry - I forgot to include the link to
http://support.microsoft.com/?id=196271
Alun.
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