I've used a tutorial. But I have problem. I using VirtualMin for host managing. I tried to work correctly and step by step with this tutorial. The main domain it was ok and up. But when I hosted any new domain, It's not correct on DNSs. Tutorial: https://www.digitalocean.com/community/articles/how-to-create-vanity-or-branded-nameservers-with-digitalocean-cloud-servers The main domain is: samac.ir The other hosted domain is: listor.ir Use this for checking DNSs: http://www.dnsinspect.com The name server's main domain(samac.ir) on droplet(VPS) is: A @ 107.170.140.195 A WWW.SAMAC.IR. 107.170.140.195 A NS1.SAMAC.IR. 198.199.120.125 A NS2.SAMAC.IR. 173.245.59.41 A NS3.SAMAC.IR. 198.41.222.173 NS NS1.SAMAC.IR. NS NS2.SAMAC.IR. NS NS3.SAMAC.IR. The name server's main domain (samac.ir) on my registrar is: NS1.SAMAC.IR. 198.199.120.125 NS2.SAMAC.IR. 173.245.59.41 NS3.SAMAC.IR. 198.41.222.173 The name server's other domain (listor.ir) on my registrar is: NS1.SAMAC.IR. NS2.SAMAC.IR. Could you please help me to solve this big problem (for me)? Thanks a lot.