Tablet reports website connection insecure won't connect

A question about : Tablet reports website connection insecure won't connect

I tried last night to log on, via my android tablet and local wifi, to a new website set up by some US friends. Tablet reported it was an insecure connection and would not connect. Our wifi here is via our Virgin Superhub which I believe is WPA maybe even WPA2 security. So why is tablet saying connection is insecure?

Best answers:

• It does indeed look like that.
  I can contact them via facebook, what should I say is the problem? That they have used https but without an SSL certificate?. Does this mean other people will have a similar access problem?.