Of course I have to agree with everyone saying "what the heck" based on the homepage. Maybe just add a "what does this do?" section to start, and be sure to describe what fields like "subdomian" actually are for.
The other major hurtle here I think is simply fear of having our Dropbox data or account stolen in some way. I'm not claiming that is in any way what you are doing, but it's a natural immediate thought, particularly for this techie security focused audience I suppose.
Either way, I really do love the idea. You might want to fix up the homepage and see if the MVP gets some traction.