The IP has stopped working

I bought a dedicated IP. I have several of them on my VPS server. I connected the Cloudflare. Yesterday one of the websites stopped working. I changed the IP address and updated the redirect from Cloudflare and now works.
I used the old IP for the new site and the Cloudflare does not work. What could it be?

What is the domain and do you feel comfortable posting the IP address here?

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