The inability to receive IMCP responses is not indicative of a a problem with the nameserver. If your website isn’t loading, what issue are you actually seeing?
mm all of these websites are located in same DC, question is why 3rth nameserver which is my Cloudflare nameserver has lots of timeout other nameservers are response without problem.
how can i change my Cloudflare nameservers to those?
yes, our customer from Dubai Iraq and Iran have to refresh website several times and most of them still cant visit our website,. when ive change DNS and remove cloudfare, problem solved. for fist step of troubleshooting i found this ping which indicates the problem,
so why they cant ping cloudflares DNS fom their network but they can ping other Cloudflare nameserver without problem ? it means there is an issue regarding my current Cloudflare nameserver