sysop@hub:~/tools/dns-not-resolving$

dns-not-resolving

"It is always DNS", in eight steps. Each one gives you the commands for Windows and Linux, tells you what to look at, and asks what you see. Start on a computer where the name fails.

what you found

corp.example, the server names and 10.87.10.5 are placeholders. Check your public records from outside with the domain check and the DNS lookup. Related: DNS and DHCP cheat sheet, dcdiag reader, networking cheat sheet, wizard: cannot reach a server or website.