Cloudflare make my website inside wp multisite don't work

Hi guys

Yesterday I have configurated in my wp multisite the Cloudflare and change the nameservers like the Cloudflare say, but today I have checked the sites inside the wp mussite installation and isn't open.
And I have change now the nameservers for the old ones.
This make the sites work again?
And now the website from wp multisite have https...