Opened 11 years ago

Closed 11 years ago

#8265 closed Bug report (rejected)

connection closed after 60seconds behind AWS ELB

Reported by: francois.legillon Owned by:
Priority: normal Component: FileZilla Client
Keywords: Cc: francois.legillon@…
Component version: Operating system type: Linux
Operating system version:



I have a ftp server (vsftpd) on a Amazon Web Services EC2 virtual machine in a production environment.
It's behind a Load Balancer, I access it using filezilla in passive mode for datas (vsftpd is configured to give the direct ip instead of using the load balancer for datas).
Data and control channel thus have different ips.
I use classic ftp (no ssl or whatever).

After exactly 60 seconds of transfer (upload or download, juste big enough to last more than 60seconds) i get a "server closed connection" error, for any version of filezilla (>=3)
that didnt segfault i tried.
But VSFTPD never actually closed the connection...

I looked into filezilla source code, the problem seems to come around in src/engine/ftpcontrolsocket.cpp.
There is a control that seems to provoke the bug in CFtpControlSocket::OnReceive...
By commenting it the problem disappear

if (!read)


LogMessage(::Error, _("Connection closed by server"));
DoClose(); <= there i commented


the transfers stall a few seconds in the end of the transfer (it might be this test purpose) but i dont lose my connexion and the file transfered is ok.

Without the ELB (using the same ip for control and data) i dont get the initial problem.

I dont think this a good fix, but it does fix the problem for me.

Change History (1)

comment:1 by Tim Kosse, 11 years ago

Resolution: rejected
Status: newclosed

Not a bug. You need to fix the underlying problem of the connection being closed instead of ignoring the close.

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