Article ID: 2776497 - View products that this article applies to.
This article describes the Office 365 DNS Diagnostic tool.
To use your own domain name with Office 365, you may have to manually set up as many as 10 DNS records at a third-party domain registrar website.
DNS misconfiguration is one of the top issues that are experienced by Office 365 customers. If DNS records are missing or are configured incorrectly, you may likely experience issues with mail flow issues, Outlook connectivity issues, Lync sign-in issues, or federation issues with external instant messaging (IM) providers.
The Office 365 DNS Diagnostic tool detects all the DNS records that are required by Office 365 services and identifies any known misconfigurations.
When to use the Office 365 DNS DiagnosticDNS misconfiguration is the top cause of the issues that are listed in this section. We strongly recommend that you run the Office 365 DNS Diagnostic to identify these issues.
Exchange Online issues
Skype for Business Online (formerly named Lync Online) issues
SharePoint Online issues
How to use the Office 365 DNS DiagnosticYou can run the Office 365 DNS Diagnostic on any computer that has Internet access. The tool queries the Office 365 DNS records from the computer’s default DNS server by using Nslookup.exe and then detects DNS misconfigurations. However, it doesn’t collect any data that is specific to the computer on which it is running.
For more information, go to the following Microsoft website:
Create DNS records for Office 365 when you manage your DNS records
Still need help? Go to the Office 365 Community
Article ID: 2776497 - Last Review: July 16, 2015 - Revision: 17.0