The primary DNS server can't be contacted_PrimaryDNSTestFailed
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Applies to: Exchange Server 2013
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Microsoft® Exchange Server 2007 setup can't continue because communication with the primary Domain Name System (DNS) server can't be established.
Exchange 2007 setup requires that the local computer communicate with the authoritative DNS database for the domain.
Microsoft Exchange depends on DNS to resolve the IP Address of its next internal or external destination server.
Communication with the primary DNS server can fail for the following reasons:
The local TCP/IP configuration doesn't point to the correct DNS server.
The DNS server is down or unreachable because of a network failure or other reasons.
To resolve this issue, verify that the local TCP/IP configuration points to the correct DNS server.
This module examines how clients connect to Microsoft 365. It also provides instruction on how to configure name resolution and Outlook clients, and how to troubleshoot client connectivity.