"Do you really want to do FTPS upload over a HTTP proxy?
You never answered to this question."

The answer is I don't know. Any method that works is fine by me.

"Is that FTP over SSL you're talking about, otherwise known as FTPS?"

Yes that's right. FTP over explicit SSL. Thanks for your help Daniel. I managed to get it working using the command:
curl -T test1.txt -u MMOFTP:Pass123 --ftp-ssl-control -k ftp://staging.missionmode.com:4121

It was not necessary for me to specify the proxy here. I have e-borders configured with the proxy on this server so this allows the connection out.
All the best.

Mick
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Received on 2011-07-20