![]() Right-click AlwaysUseMSOAuthForAutoDiscover, and then click Modify. Type AlwaysUseMSOAuthForAutoDiscover, and then press Enter. On the Edit menu, point to New, and then click DWORD Value. In Registry Editor, locate and click the following registry subkey: 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.Start Registry Editor by using one of the following procedures, as appropriate for your version of Windows: We recommend that users force Outlook to use Modern Authentication. Before you modify it, back up the registry for restoration in case problems occur.Ĭreate the following registry key to force Outlook to use a newer authentication method for web services, such as EWS and Autodiscover. Serious problems might occur if you modify the registry incorrectly. ![]() Click OK.Follow the steps in this section carefully. Select Windows authentication, click ADVANCED SETTINGS, select ENABLE KERNEL-MODE AUTHENTICATION. Set status DISABLED for Anonymous authentication.ħ. Locate virtual directories for Autodiscover and EWS (Exchange Web Services) under default website.Ħ. ![]() Here are the steps I had to perform to fix this issue.ģ. The irony in all this, I had run into a similar issue with Exchange 2007 several years earlier. Reading two different articles one from TechNet: After Migration to Exchange 2013 – Credential user keep prompting on Outlook 2010 SP1 and Microsoft KB Article: Users of Exchange Server 2013 or Exchange Online can’t open public folders or shared mailboxes on an Exchange 2010 or Exchange 2007 server, I had tried different solutions ranging from changing authentication protocol to NTLM to Kernel-Mode Authentication for RPC and other virtual directories. These prompts had appeared during the opening of Outlook, Lync and intermittently thereafter. ![]() As I started to move accounts over employees begun receiving prompts to enter their credentials for Outlook 2010/2013 and sometimes Lync 2013. Recently, I had started migration of mailboxes to Microsoft Exchange 2013 CU1. ![]()
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