[Zope] ssh tunnel with zope?

[Zope Ista]

Has anybody got a passive FTP tunnel working over ssh
to a Zope server? I looked around on Zope.org for a
howto or other tips and none were to be had.

I'm simply listening on port 21 and forwarding that
127.0.0.1 on the remote server.

WebDAV tunnels without a problem but is problematic on
bulk uploads. Uploading one or two files at a time is
fine but more than that causes it to go into a
tailspin and crash the Zope server (2.5.1).

Any tips would be most welcome (including "yeah, you
can't do that FTP thing").

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