[squid-users] Timeouts when using squid as an FTP proxy with FileZilla?

I've been trying to use our Squid server to proxy FTP traffic.

The client is FileZilla. It is configured to use the squid server as
an HTTP 1.1 proxy.

I can connect to a remote site without difficulty (yes, I have to
enable the CONNECT method for this). The remote site has an idle
timeout of 15 minutes.

Everything works fine until I try to send a file to the remote site.
When sending a file (FTP STOR command) the transfer is cut at exactly
15 minutes. FileZilla reports that it detected a timeout and has
disconnected from the server.

If I bypass the Squid server then I can send the file (which takes
about 18 minutes to transmit) without difficulty.

There doesn't appear to be a problem fetching files, only sending them.

Can anyone shed any light as to possible reasons? I've RTFM and
checked this mailing list archive but have drawn a blank so far. I
can't see anything in our squid.conf which would cause a timeout when
tunnelling FTP.

Squid version is squid-2.5.STABLE5-42.47 (as distributed with SLES 9).

Thanks,
    Jeremy

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Jeremy Webber                                   Senior Systems Engineer
                                                    Animal Logic Pty Ltd
Phone: +61 2 9383 4837   Fax: +61 2 9383 4801   Switch: +61 2 9383 4800