Premature "Closed Connection" with Serv-U

[ESELICK]

Hi
I'm using the latest version of Serv-U on a WIndows XP machine. I'm
putting files an FTP client on an AS400.. My problem is that Serv-U
appears to be closing the connection after successfully transferring
one of my larger files (around 180 Mb).
Here is the log from the AS400:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Input read from specified override file.
Connecting to remote host 206.248.150.26 using port 21.
220 Serv-U FTP Server v10.1 ready...
Enter login ID (dina):
331 User name okay, need password.
230 User logged in, proceed.
UNIX Type: L8
Enter an FTP subcommand.
> CD WEEK_4
250 Directory changed to /WEEK_4
Enter an FTP subcommand.
> BINARY
200 Type set to I.
Enter an FTP subcommand.
> LCD R6BACKUP
Local working directory is R6BACKUP
Enter an FTP subcommand.
> put R6LIB
227 Entering Passive Mode (206,248,150,26,11,158).
150 Opening BINARY mode data connection for R6LIB.
No response from remote host; all connections closed.
Enter an FTP subcommand.
> put R6MF01OLD
You must first issue the OPEN subcommand.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

The connection is closed (apparently by Serv-U) after the "R6LIB" file
is transferred.

Here is the activity log from Serv-U

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Serv-U Log output
[02] Wed 30Jun10 14:49:22 - (000003) Connected to 69.70.189.54 (local
address 128.1.0.5, port 21)
[03] Wed 30Jun10 14:49:22 - (000003) IP-Name: libbk.liberty-i.net
(69.70.189.54)
[02] Wed 30Jun10 14:49:22 - (000003) User "AS4BAK" logged in
[11] Wed 30Jun10 14:49:23 - (000003) Receiving file "C:\Facts\AS4BACKUP
\WEEK_4\R6LIB"
[11] Wed 30Jun10 15:48:33 - (000003) Received file "C:\Facts\AS4BACKUP
\WEEK_4\R6LIB" successfully (51.09 KB/sec - 185,698,656 Bytes)
[21] Wed 30Jun10 15:48:33 - (000003) 226 Transfer complete.
185,698,656 bytes transferred. 51.09 KB/sec.

[02] Wed 30Jun10 15:48:33 - (000003) Closed session

[02] Wed 30Jun10 15:48:33 - (000003) User "AS4BAK" logged out
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Why is Serv-U closing the session?

Thanks
Elliot

[FTPServerTools]

Can you try this with another ftp program??