i installed ISPConfig 3 in a droplet debian 9
all work good unit of the dns when i added a domain name but
when i try to access to my domain i have this error ERRNAMERESOLUTION_FAILED
also with nslookup i have : ** server can’t find leadprospector.co: SERVFAIL
this is my config : http://prntscr.com/glw1ak

thank you

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Note that it can take between 1 and 72 hours for your DNS cache to clear over the Globe after each change.

What you could usually do is try to do a DNS lookup within your nameservers directly:

dig a yourdomain.com @ns1.yournameserver.com

That way you would know if it is a DNS cache issue or if you actually need to further investigate your DNS setup.