I think I have a quite interesting problem here:
So, I set up a new centOS server, and installed centminmod
following the instructions here: CentMinMod Tutorial 1 - Digital Ocean + Cloudflare + nginx - YouTube
I set up a vhost nginx domain,
and after the installation I was able to choose ‘Full /strict’ mode in my Cloudflare dashboard.
All was working fine: The page was reloading, the full/strict mode was working.
However, following the tutorial from here on, I made a mistake and had to delete the complete instance, and restart from 0.
I also deleted the domain/site in my Cloudflare dashboard.
As I was setting up the site again, on a fresh centOS server, and added my domain name again & new to the Cloudflare dashboard, I realized that settings, that I had made in my Cloudflare dashboard > old domain were the same.
(It did not start from default, but took the advanced settings I had set up earlier on my old install. process).
That’s why the site was not reachable, I had to manually deactivate many settings and put it to default, to be able to work.
So, this was already suspicious to me:
Altough I had deleted that domain/site from Cloudflare,
it took the old advanced settings, and put them into the new domain/site account
that I just opened up again
(of course, using the same domain).
Then, after install. process, I should be able to upgrade from ‘full’ to ‘full/ strict’ mode,
as it had been before (and worked)
but when upgrading in my db, the site is out of reach and it says to me:
Not valid SSL certiciate.
So, my assumption here again is:
The system is still tied to the old server, I had set up, and where everything had worked.
Of course, when I set up the new Cloudflare domain/site account, I used the New IP adress
(as I restarted with a new centOS server).
Still, it took the old adv. settings from the old domain/site account - that I previously deleted.
And now I cannot make use of ‘full/strict’ mode.
I hope you understood, what I mean.
Can someone help me with that?