Here is a filezilla log of a standard ftp session. During file transfer the LIST command results in a disconnect from
server. The file transfer however continues and is finally aborted by me.

Status:	Resolving IP-Address for dom
Trace:	ControlSocket.cpp(979): CRealControlSocket::ContinueConnect(0x8a3cf98) m_pEngine=0x87898f0   caller=0x8a61828
Status:	Connecting to 192.168.1.67:21...
Status:	Connection established, waiting for welcome message...
Trace:	CFtpControlSocket::OnReceive()
Response:	220 Welcome to Exetron's FTP service.
Trace:	CFtpControlSocket::SendNextCommand()
Command:	USER exetron
Status:	Connection established, waiting for welcome message...
Trace:	CFtpControlSocket::OnReceive()
Response:	331 Please specify the password.
Trace:	CFtpControlSocket::SendNextCommand()
Command:	PASS ********
Trace:	CFtpControlSocket::OnReceive()
Response:	230 Login successful.
Trace:	CFtpControlSocket::SendNextCommand()
Command:	OPTS UTF8 ON
Trace:	CFtpControlSocket::OnReceive()
Response:	200 Always in UTF8 mode.
Status:	Connected
Trace:	CFtpControlSocket::ResetOperation(0)
Trace:	CControlSocket::ResetOperation(0)
Status:	Retrieving directory listing...
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::ChangeDirSend()
Command:	PWD
Trace:	CFtpControlSocket::OnReceive()
Response:	257 "/"
Trace:	CFtpControlSocket::ResetOperation(0)
Trace:	CControlSocket::ResetOperation(0)
Trace:	CFtpControlSocket::ParseSubcommandResult(0)
Trace:	CFtpControlSocket::ListSubcommandResult()
Trace:	CFtpControlSocket::ResetOperation(0)
Trace:	CControlSocket::ResetOperation(0)
Status:	Directory listing successful
Status:	Resolving IP-Address for dom
Trace:	ControlSocket.cpp(979): CRealControlSocket::ContinueConnect(0x8a36480) m_pEngine=0x8838a58   caller=0x8aa43c8
Status:	Connecting to 192.168.1.67:21...
Status:	Connection established, waiting for welcome message...
Trace:	CFtpControlSocket::OnReceive()
Response:	220 Welcome to Exetron's FTP service.
Trace:	CFtpControlSocket::SendNextCommand()
Command:	USER exetron
Status:	Connection established, waiting for welcome message...
Trace:	CFtpControlSocket::OnReceive()
Response:	331 Please specify the password.
Trace:	CFtpControlSocket::SendNextCommand()
Command:	PASS ********
Trace:	CFtpControlSocket::OnReceive()
Response:	230 Login successful.
Trace:	CFtpControlSocket::SendNextCommand()
Command:	OPTS UTF8 ON
Trace:	CFtpControlSocket::OnReceive()
Response:	200 Always in UTF8 mode.
Status:	Connected
Trace:	CFtpControlSocket::ResetOperation(0)
Trace:	CControlSocket::ResetOperation(0)
Trace:	CFtpControlSocket::FileTransfer()
Status:	Starting download of /pub/linux/distros/ubuntu/ubuntu-8.10-desktop-i386.iso
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::ChangeDirSend()
Command:	CWD /pub/linux/distros/ubuntu/
Trace:	CFtpControlSocket::OnReceive()
Response:	250 Directory successfully changed.
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::ChangeDirSend()
Command:	PWD
Trace:	CFtpControlSocket::OnReceive()
Response:	257 "/pub/linux/distros/ubuntu"
Trace:	CFtpControlSocket::ResetOperation(0)
Trace:	CControlSocket::ResetOperation(0)
Trace:	CFtpControlSocket::ParseSubcommandResult(0)
Trace:	FileTransferSubcommandResult()
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	FileTransferSend()
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::TransferSend()
Command:	TYPE I
Trace:	CFtpControlSocket::OnReceive()
Response:	200 Switching to Binary mode.
Trace:	CFtpControlSocket::TransferParseResponse()
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::TransferSend()
Command:	PASV
Trace:	CFtpControlSocket::OnReceive()
Response:	227 Entering Passive Mode (192,168,1,67,192,0)
Trace:	CFtpControlSocket::TransferParseResponse()
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::TransferSend()
Command:	RETR ubuntu-8.10-desktop-i386.iso
Trace:	CFtpControlSocket::OnReceive()
Response:	150 Opening BINARY mode data connection for ubuntu-8.10-desktop-i386.iso (732766208 bytes).
Trace:	CFtpControlSocket::TransferParseResponse()
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::TransferSend()
Trace:	Postponing receive, m_pBackend was false.
Trace:	CTransferSocket::OnConnect
Trace:	Executing postponed receive
Status:	Retrieving directory listing...
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::ChangeDirSend()
Command:	CWD /pub/linux/
Trace:	CFtpControlSocket::OnReceive()
Response:	250 Directory successfully changed.
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::ChangeDirSend()
Command:	PWD
Trace:	CFtpControlSocket::OnReceive()
Response:	257 "/pub/linux"
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::ChangeDirSend()
Command:	CWD games
Trace:	CFtpControlSocket::OnReceive()
Response:	250 Directory successfully changed.
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::ChangeDirSend()
Command:	PWD
Trace:	CFtpControlSocket::OnReceive()
Response:	257 "/pub/linux/games"
Trace:	CFtpControlSocket::ResetOperation(0)
Trace:	CControlSocket::ResetOperation(0)
Trace:	CFtpControlSocket::ParseSubcommandResult(0)
Trace:	CFtpControlSocket::ListSubcommandResult()
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::TransferSend()
Command:	TYPE I
Trace:	CFtpControlSocket::OnReceive()
Response:	200 Switching to Binary mode.
Trace:	CFtpControlSocket::TransferParseResponse()
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::TransferSend()
Command:	PASV
Trace:	CFtpControlSocket::OnReceive()
Response:	500 OOPS: vsf_sysutil_bind
Trace:	CFtpControlSocket::TransferParseResponse()
Trace:	CFtpControlSocket::SendNextCommand()
Trace:	CFtpControlSocket::TransferSend()
Command:	PORT 192,168,1,69,134,206
Response:	500 OOPS: child died
Trace:	CFtpControlSocket::TransferParseResponse()
Trace:	CFtpControlSocket::ResetOperation(2)
Trace:	CControlSocket::ResetOperation(2)
Trace:	CFtpControlSocket::ParseSubcommandResult(2)
Trace:	CFtpControlSocket::ListSubcommandResult()
Trace:	CFtpControlSocket::ResetOperation(2)
Trace:	CControlSocket::ResetOperation(2)
Error:	Failed to retrieve directory listing
Trace:	CRealControlSocket::OnClose()
Error:	Disconnected from server
Trace:	CFtpControlSocket::ResetOperation(66)
Trace:	CControlSocket::ResetOperation(66)
Trace:	CFtpControlSocket::ResetOperation(10)
Trace:	CControlSocket::ResetOperation(10)
Trace:	CFtpControlSocket::ResetOperation(10)
Trace:	CControlSocket::ResetOperation(10)
Error:	Transfer aborted by user
Trace:	CFtpControlSocket::OnReceive()
Response:	426 Failure writing network stream.
Trace:	Skipping reply after cancelled operation or keepalive command.
Status:	Disconnected from server
Trace:	CFtpControlSocket::ResetOperation(66)
Trace:	CControlSocket::ResetOperation(66)