How to use the Office 365 DNS Diagnostic Tool 2023

the DNS Office 365 diagnostic tool detects all DNS records required by Office 365 services and identifies known configuration errors. In this article, we will describe when and how to use the Office 365 DNS diagnostic tool to resolve issues.

You can run the Office 365 DNS diagnostic on any computer with Internet access. The tool queries the Office 365 DNS records from the computer’s default DNS server using Nslookup.exe, and then detects DNS configuration errors. However, it does not collect any data specific to the computer on which it is running.

DNS Office 365 diagnostic tool

According to Microsoft:

A bad DNS configuration is one of the main issues faced by Office 365 customers. If the DNS records are missing or misconfigured, you can probably have problems with mail flow issues, Outlook connectivity issues, issues Lync connection issues or federation issues with external Instant Messaging (IM) providers.

1]When to use the Office 365 DNS diagnostic tool

A bad DNS configuration is the main cause of the problems listed below. Microsoft strongly recommends that you run the Office 365 DNS diagnostic to identify these issues:

a]Exchange Online Problems

Problems with mail delivery

Do not receive incoming mail from the Internet.
Receipt of non-delivery reports (NDR).

Outlook client connectivity

Problems involving connecting Outlook and Exchange Online.
Automatic discovery does not work.

b]Problems with Skype for Business Online (formerly known as Lync Online)

Lync client connection issues.
Instant messaging (IM) failure with federated or public IM connectivity (PIC) contacts.
Instant messaging or presence issues in Outlook Web App.

vs]Problems with SharePoint Online

Access the publicly accessible website that uses your domain name.

2]How to use the Office 365 DNS diagnostic tool

To use the O365 DNS diagnostic tool, follow these steps:

1]On the Client’s domain name Offive365 Office 365 DNS Diagnostic page, type your domain name. The tool checks the domain’s DNS records.

Make sure the domain is added to portal.Office.com and that the domain is verified.

2. On the Exchange deployment scenario , select the scenario that applies to you. The options are Cloud only and Coexist / hybrid.

If you have multiple domains, be aware that the scenario you select applies to the domain you entered in step 1.

To select Cloud only if all mailboxes in this domain have been moved to Office 365.
To select Cloud only if you do not have an Exchange Online mailbox using the domain.
To select Coexist / hybrid if some mailboxes are hosted in the local Exchange Server environment and some mailboxes are hosted on Exchange Online.

That’s it, friends! I hope you find this post informative enough.

POINT: Also take a look at Microsoft Support and Recovery Assistant.

Keywords: Network, Office 365