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The Outlook client cannot be used until they come back inside our network and reboot their PC. Entering their password will close the window, then the window will immediately pop back up. They will suddenly be asked to enter their password in Outlook (the larger, white, browser-based modern authentication window, not the small Outlook client username/password authentication window). Right-click MapiHttpDisabled and then click Modify.Ĭhange the Value data to 0 and then click OK.įor more information about the requirements for MAPI over HTTP connections, see MAPI over HTTP.In the past ~1-2 months, our travelling users have been running into an authentication loop in Outlook 2016. Locate and select the following key in the registry: HKEY_CURRENT_USER\Software\Microsoft\Exchange Windows 7: Click Start, type regedit.exe in the search box, and then press Enter.Windows 10, Windows 8.1, and Windows 8: Press Windows Key + R to open a Run dialog box.Open Registry Editor by using one of the following procedures, as appropriate for your version of Windows: This registry data is intended for testing purposes only. To resolve this problem, change the value of MapiHttpDisabled to 0 (zero) or delete the MapiHttpDisabled DWORD value. This problem can occur if the MapiHttp feature is disabled on the Outlook client using the following registry value: Key: HKEY_CURRENT_USER\Software\Microsoft\Exchange

MAPI/HTTP connections are designated in the Protocol column using the string HTTP.Īdditionally, if MAPI/HTTP is disabled, Microsoft 365 users receive a Basic Authentication prompt instead of a Modern Authentication prompt.