Uh, I feel so stupid, and am a bit out of my depth here.
I needed to move a site to a new server. Six months ago I set up HTTPS through Cloudflare (free account). Tonight I stupidly updated the name servers to the new hosting account, rather than doing it through Cloudflare. Now the site is inaccessible, because I set up HSTS back in the day (following Troy Hunt’s advice).
I quickly changed the name servers back to point to Cloudflare, but the damage seems to be done. I’m getting an invalid cert warning, because the browsers have all picked up an unsigned certificate from the new host. I don’t seem to be able to get back to using the Cloudflare cert.
Is there anything I can do here? I’m a bit lost, and feeling very incompetent!
Thanks for any help.