Not sure how to use MLS. 0 properties found for all searches?

[Jared G.]

I don't "get" how you use the MLS. Whenever I make a search for Washington, DC I am directed to a 404 error page. When I search in nearby Baltimore, I get 0 properties found for nearly every neighborhood I try, and those that do have something are mostly empty land.

What's the issue here? Not finding good deals is one thing, but not even finding anything listed seems like something's wrong.