Yeah spot on routercnc, it's because it uses the older http rather than the more secure Https:// - in order to use Https you need to pay for a certificate. It's a bit pointless here when we're talking about routers and not doing our internet banking, but the boffins that be at Microsoft and Google have decided it's best to declare anyone who doesn't pay extra for the security certificate (and the encrypted communications that enables) as insecure. It's kinda useful if you're about to divulge your bank details but otherwise....