Outlook is connecting to website’s Autodiscover

March 25, 2019 | by iaur | posted as Failure, Outlook 365

Scenario

• When you bought the domain from a provider (Hostgator, GoDaddy, etc.) you may have included email services
• You port out your domain from a service provider and add it to Microsoft 365
• You are unable to setup Outlook to connect to its M365 mailbox
• When you use Outlook connectivity tool it is connecting to the ROOT domain autodiscover (https://domain.com/Autodiscover/Autodiscover.xml)
• When accessing directly the URL it gives you below screenshot and that means that the website or its DNS host is broadcasting address

https://domain.com/Autodiscover/Autodiscover.xml

Checked who is hosting the web site : https://hostingchecker.com

The issue is that the you have a 3rd party Autodiscover on your Website.

You can see it if you click the following link: Link: https://domain.com/Autodiscover/Autodiscover.xml

Workaround

Exclude root domain in the Outlook Autodiscover journey. Access this link and navigate to Method 9. Head’s up, this solution should be applied per machine in your organization.

Resolution

Tenant-wide solution.

Contact your DNS host or Web Host and disable the “AutoDiscover / AutoConfig Support”. Once disabled, access again the link above then you should be expecting “site cannot be reached” error.

Once then, clear outlook cache, restart the machine and setup outlook