EDIT: Added the *.vhost.err and intoDNS errors at the comments Hello everyone: I'm a very newbie at this, is the first time that I configure a server, was searching at Google how to setup an Ubuntu server to host domains and I found: The Perfect Server - Ubuntu 16.04 (Xenial Xerus) with Apache, PHP, MySQL, PureFTPD, BIND, Postfix, Dovecot and ISPConfig 3.1 So I followed the steps to configure my "perfect" server, all was okay, I created my firsts sites with their DNS for the domains and few subdomains, the configuration at domains provider was pretty easy because I just had to set my public IP at the domain's configuration. Our DNS configuration for the domains was: Client: our client Domain: ourclientdomain(.)com IP Address: Our Public IP Address NS: ns1.ourclientdomain(.)com NS2: ns2.ourclientdomain(.)com Was a sweet dream, was the first time that I configured a server, and all is working, incredible.. But they came new clients, from Mexico so We had to register (.)mx domains, so We did it at akky(.)mx , all was going as the rest of the domains registrations, but the surprise came when We had to set the DNS of our server and the IP of the DNS, so We typed the DNS for the domain like the previous domains: DNS: ns1.ourmexicanclientdomain(.)mx IP: Our Public IP Address But this was not working, We made pings to the domains to know which IP were they using but were receiving the following error: ping: unknown host ourmexicanclientdomain(.)mx and the "Server not found" when tried to access from browsers. Akky does not provide a solution, because they just offers the domains name register, and they can't verify if my server configuration is the properly. Right now I'm stuck on this step because I've no idea how to fix this problem and why is not working as it worked with the rest of domains. Hope someone could gives me a solution, or almost tell me what's wrong at my configuration. There's the configuration of my server for the (.)mx domains: DNS Config: Client: my client Zone (SOA): myclientweb(.)mx NS: ns1.myclientweb(.)mx Email: [email protected] Refresh: 7200 Retry;540 Expire:604800 Minimum:3600 TTL:3600 Allow zone transfers to these IP's: - Sign zone (DNSSEC): not checked DNS Records Type: A Name: myclientweb(.)mx Data: my public ip priority: 0 TTL: 3600 -- Type: A Name: www Data: my public ip Priority: 0 TTL: 3600 -- Type: CNAME Name: myclientweb(.)mx Data: my public ip Priority: 0 TTL: 3600 -- Type: NS Name: myclientweb(.)mx Data: ns1.myclientweb(.)mx Priority: 0 TTL: 3600 -- Type: NS Name: myclientweb(.)mx Data: ns2.myclientweb(.)mx Priority: 0 TTL: 3600 -- Type: TXT Name: myclientweb(.)mx Data: v=spf1 mx a ~all Priority: 0 TTL: 3600 Sites Configuration: Server: myserver.example(.)com Client: myclient IPv4-Address: * Domain: myclientdomain(.)mx Document Root: /var/www/client/clientX/webX CGI: - SSI: - Perl: - Ruby: - Python: - SuEXEC: V Own Error-Documents: V Auto-Subdomain: none SSL: - Lets Encrypt SSL: - PHP: Fast-CGI PHP Version: Default Web server config: - Active: V Akky domains config: DNS: ns1.myclientweb(.)mx IP: mypublicip That's all about my basic config, if you need more information, I will be pleased to post it at comments. Thanks you so much in advance. Best regards, Alex.