[Alan_SP]

I recently had just that, on one site I administer.

Site is behind CloudFlare, which causes that issue. I used this to be able to force https:

Block Disabled:      (Update License Status)
Suspended or Unlicensed Members Cannot View Code.

Found solution here: https://stackoverflow.com/questions/...to-force-https

Not sure will it help you, as I always had "too many redirects" when I tried to force https. This is only thing that worked.