Hosted Exchange Known Issues: Cpanel Autodiscover Conflict

Summary

Outlook autodiscover fails to work even when the correct SRV record is added for your domain

Cause

If your website runs on Cpanel, you may get a conflict when trying to use outlook autodiscover, this is because Outlook will check the root domain first for https://domain/Autodiscover/Autodiscover.xml  which cpanel will serve by default.

Resolution

There are 2 options (only one needs to be completed), either on the service provider side or the client side.

1. At the hosting provider

1. Ask them to Navigate to the Domains section of WHM's Tweak Settings interface (WHM >> Home >> Server Configuration >> Tweak Settings).
2. Locate the Thunderbird and Outlook autodiscover and autoconfig support (enables proxy subdomain and SRV record creation) setting and select Off.
3. Click Save.

2. On The Client

1. Close Outlook

2. Start Registry Editor.
In Windows 10 and Windows 8, press the Windows Key + R to open a Run dialog box. Type regedit.exe and then press OK.
In Windows 7, click Start , type regedit in the Search programs and files box, and then press Enter.

3.Locate and then select the following registry subkey:

HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\AutoDiscover

Notex.0 in this registry path corresponds to the Outlook version (16.0 = Outlook 2016, 15.0 = Outlook 2013, 14.0 = Outlook 2010, 12.0 = Outlook 2007).

4. Right click and add a new DWORD ExcludeHttpsRootDomain and set the value to 1 (Decimal)
5. Close the registry editor and open outlook
6. Configure your profile