Yesterday, Roskomnadzor blocked the ESN service from CloudFlare, which is forcibly enabled for all sites protected by CF

To correct the situation, you need to disable this very ECH function.

On PRO tariffs, this can be done directly in the domain settings

on Free tariffs you need to execute the CURL command replacing ZONE_ID and API_KEY with your own:

curl -X PATCH "https://api.cloudflare.com/client/v4/zones/{ZONE_ID}/settings/ech" \
     -H "Authorization: Bearer {API_KEY}" \
     -H "Content-Type:application/json" --data '{"id":"ech","value":"off"}'

If the first option doesn't work, there is a second one:

curl -X PATCH "https://api.cloudflare.com/client/v4/zones/DOMAIN_KEY/settings/ech" \

-H "X-Auth-Email: EMAIL_ACCOUNT"\

-H "X-Auth-Key: GLOBAL_API_KEY" \

-H "Content-Type: application/json" \

--data '{"id":"ech","value":"off"}'

DOMAIN_KEY - Zone ID of the domain

EMAIL_ACCOUNT - your cloudflare account email

GLOBAL_API_KEY - on the page https://dash.cloudflare.com/profile/api-tokens