I'm guessing you're a Google Chrome user? I was just informed about this the other day and from what I found I believe it's simply warming you that you're connecting to an HTTP site which does not encrypt traffic when you log in. This is not a problem with the site so much as it's by design.
That said we are actively working on encrypted sessions, I've been personally testing it, as an IT professional encrypting sessions, especially logins, is a priority to me. I expect to enable and force encrypted sessions when we execute the forthcoming forum upgrade. Until then you should be able to simply ignore the message. Be aware that there is no path into your equipment.