HTTP Status 400 - Invalid path /LoginPage was requested

HTTP Status 400 - Invalid path /LoginPage was requested

I just installed NetFlow Analyzer to give it a shot and I can't get it to run, even after a reboot. The error I get is:


I did some searching on here before registering, and the only item I could find with the error above was from 2013 and the recommended solution was updating it, so I don't think that's the solution here as I downloaded the current version today. Nothing else runs on this server (fresh install of Server 2012 R2), so I'm at a loss as to what could be going on here.

Any ideas?
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