Is there a program, preferably for Mac OS 7.x, that will allow you to take information from one IP port, and relay it onto another with authentication?

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You might want to be a bit more specific than that.

1. Do you mean have a listener on port X that then establishes another stream to connect to port Y on the same box?

2. TCP/IP has no authentication. What authentication were you thinking of?

3. You may find that MacSSH may be able to do what you want, but I can't tell from your vague requirements.