What is the name of the domain?
What is the error message?
Invalid nameservers
What is the issue you’re encountering
After some weeks of service (all was fine), Cloudflare says nameservers are invalid
What steps have you taken to resolve the issue?
Check and rechanged name saervers at registrar
Checked ICANN Lookup for confirmation
What feature, service or problem is this related to?
DNS not responding/updating
What are the steps to reproduce the issue?
Pinging or making a lookup fails, as no DNS server serves the domain