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AuthorForum: PowerTCP FTP for .NET
Topic: Uploading file fails, a bunch of PORT statements after starting sending a file
izchak

From: Fort Lauderdale, FL USA
Posts: 7
Member Since: 07/12/04
posted March 28, 2006 4:27 PM

Hello everybody,

I am using version 1.0.2 of Secure FTP for .NET (haven't had a chance to upgrade)

My FTP server is running "Version 6.6/OpenBSD"

It doesn't happen to any other of my clients, except this one. I'm trying to figure it out, and I'm assuming it has something to do with firewalls issues. I have tried to connect both with and without Passive, and the result is the same.

The file begins to upload, and if it's small enough, it will go through. The big ones, though, they get stuck, and the log will show tens of PORT statements, such as these:

<--- 220 xxxx.xxxxx.com FTP server (Version 6.6/OpenBSD) ready.

---> USER yyyy

<--- 331 Password required for wis.

---> PASS zzzzzz

<--- 230 User yyyy logged in.

---> TYPE I

<--- 200 Type set to I.

---> PORT 10,10,0,25,16,247

<--- 200 PORT command successful.

---> STOR /dropoff/incoming/1_1_030920061601267998.tif

<--- 150 Opening BINARY mode data connection for '/dropoff/incoming/1_1_030920061601267998.tif'.

---> PORT 10,10,0,25,16,250

---> PORT 10,10,0,25,16,253

---> PORT 10,10,0,25,16,253

---> PORT 10,10,0,25,17,0

---> PORT 10,10,0,25,17,0

---> PORT 10,10,0,25,17,0

---> PORT 10,10,0,25,17,0

---> PORT 10,10,0,25,17,14

---> PORT 10,10,0,25,17,14

---> PORT 10,10,0,25,17,14

---> PORT 10,10,0,25,17,14

---> PORT 10,10,0,25,17,14

.... and so it goes on and on...

What does this issue indicate on?

Any ideas that might shed some light on this would be very helpful and appreciated.

Thanks,
Isaac
Raj

From: Rome, NY, USA
Posts: 389
Member Since: 02/01/06
posted March 29, 2006 8:51 AM

The trace shows a PORT command, but the server never seems to respond.
I believe at this point the control would timeout.
I wonder if your application just keeps trying a new transfer, every time there is a timeout?
I believe that would explain the log.

-Raj
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