It seems that cloudflare has banned my domain name according to what the technical team of my host says, before they configured my domain and have their own server and after cloudflare sent me this mail:
[…The name servers for mydomain.com no longer point to Cloudflare. They now point to:
This change means that mydomain.com is no longer using Cloudflare and will not receive the benefits of our security and performance services. Your DNS records will be completely removed from our system in 7 days.
If the name server change was in error, reactivate your domain by pointing your nameservers back to:
Once you have completed this change, click the “Recheck Nameservers” button in your Cloudflare dashboard to ensure your domain stays active on Cloudflare. …]
So, I did it like cloudflare told me, hey! Boom. My web site now offline.
I contacted my web host and they told me that cloudflare has banned my domain name they configured for me and I’m doing mine so my site has to stay offline.