Non-SSL security for Sage Math Servers

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I am running a Sage Math server on RackSpace and I have to run it in "secure=False' mode as I cannot have SSL active. I am told that the official sage math server at www.sagenb.org also doesnt use SSL. My question is, how best should I make my server reasonably secure without invoking SSL handshaking? I would particularly appreciate knowing how this is done at sagenb.org as your system seems reasonably secure. Any advice (other than asking it to be run in "secure=True" mode) would be most MathBear