What Is the Organization FQDN in Exchange Hybrid Configuration Wizard?
Question details
The user needs to understand what the Organization FQDN field in the Exchange Hybrid Configuration Wizard represents and which publicly accessible server name to enter.
- Product
- Microsoft Exchange Hybrid Configuration Wizard and Exchange Online
- Device & OS
- not provided
- Scenario
- Configuring a hybrid connection between on-premises Microsoft Exchange and Exchange Online in Microsoft 365.
- Observed behavior
- The user wants to enter the publicly accessible FQDN of the Internet-facing on-premises Exchange server instead of internal names or the primary email domain.
Before you start, confirm whether the hybrid endpoint is the Internet-facing Exchange server or an Edge Transport server, and have access to your public DNS records for verification.
Enter the External FQDN of the Internet-Facing Exchange or Edge Transport Server
Use this when the Hybrid Configuration Wizard asks for the Organization FQDN and you need to supply the correct hybrid endpoint name.
The Organization FQDN is the public hostname that Microsoft 365 uses to reach your on-premises hybrid endpoint. It is not necessarily your primary email domain, Active Directory forest name, or email security appliance name.
Determine whether your hybrid mail flow endpoint is the on-premises Exchange server or an Edge Transport server. Use that server's external FQDN, such as mail.contoso.com.
In the Hybrid Configuration Wizard, locate the Organization FQDN field and type the exact external FQDN of the Internet-facing Exchange or Edge Transport server.
Proceed through the wizard so Microsoft 365 uses the entered FQDN to create secure mail flow connectors between on-premises Exchange and Exchange Online.
Verify Public DNS Resolution and Internet Reachability of the FQDN
Use this check when the Hybrid Configuration Wizard fails to connect or before you re-run the wizard to avoid mismatched endpoint errors.
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Frequently Asked Questions
Is the Organization FQDN the same as my primary email domain?
Not usually. Enter the external FQDN of the Internet-facing Exchange or Edge Transport server, such as mail.contoso.com, unless that exact name is also the designated hybrid endpoint and resolves in public DNS.
Where do I find the Organization FQDN field?
The field appears in the Exchange Hybrid Configuration Wizard when you connect on-premises Exchange to Exchange Online. It is part of the hybrid endpoint settings used to create mail flow connectors.
Should I enter the Active Directory forest name in the Organization FQDN field?
No. The wizard expects a publicly accessible FQDN, not an internal Active Directory forest name, internal server name, or primary email domain.
What should I check if the Hybrid Configuration Wizard cannot connect using the Organization FQDN?
Check that the FQDN resolves in public DNS to the public IP of the Internet-facing Exchange or Edge Transport server, and confirm the required HTTPS connectivity from Microsoft 365 is allowed.
