Hello Yancey,
We're sorry you're having trouble using our product. To address your first question, you don't need 2 nics for our software. It works just fine with 1 nic in server-only mode or dial-on-demand mode. Which mode are you trying to use? And are you working with version 3.0 of our software? (Version 2.0 did not support the server-only mode.)
If you can't get to the web interface, my guess is that you have configured it for server and gateway mode, but are trying to use it in server only mode. In that case, the e-smith software thinks your requests for the web-based manager are coming from outside the local network, and it is denying you access for security reasons.