Hi,
unfortunately you cannot really attach any authentication mechanism to TCP proxy service as it just a "dump pipe" that forwards all the traffic through to the backend. The purpose of TCP Proxy service, as I have understood it, is to provide an easier access to services sitting behind DataPower and somewhat simplify the network setup.... As long as one knows the pitfalls of a such configuration because in the right circumstances it can give you the power to drill holes to your firewalls and thus bypass the outer security mechanisms.
Some of my customers have just placed an SSH server to the DMZ with hardened setup + implemented audit logging and used it to allow the access to other resources in a controlled manner.
--HP
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