![]() ![]() Honestly though if you want a prompt resolution you probably need to engage a specialist. I'd start by examining the health and patch levels of Exchange and the underlying Windows OS, do the same with AD, and then start dissecting the autodiscover XML response to look for possible misconfigurations or omissions. Realistically though without being able to see the context or dig in to more information in real time it's not the sort of problem that has a single common cause. If it's suddenly started happening to everyone then something, somewhere must have changed: that change doesn't necessarily have to be directly on the Exchange server itself. If it is a normal credential thing it's needle in a haystack stuff unfortunately. If you have any question, please browse our other support articles, or contact us directly.Is it a UAC prompt (secure desktop, darkened screen, specific mention of administrator or elevation), standard windows credential prompt, or a certificate prompt? Based on the OP text I'm guessing standard credential prompt, but others seem to be implying it's cert-based. Method 3: Revert to an earlier version of Office 2016įollow this Microsoft guide to learn how to revert to an earlier version of Outlook. Note: Alternatively, you can rename the file(s) instead of deleting them. ![]() Cause This issue occurs because Outlook 2016 or 2010 keeps trying to use the credentials that were cached for the old RPC over HTTP protocol. (Ex: 6b8cf067fad71d4b8b28c4f07b8b56f5 - Autodiscover.xml) After the change, Outlook 2016 or Outlook 2010 users are repeatedly prompted for credentials to connect to Exchange Server. Delete the file(s) that ends in Autodiscover.xml. ![]() Enter %LocalAppData% in the Windows search bar and navigate to Microsoft > Outlook.ĥ. Select any record(s) associated with your Exchange mailbox.Ĥ. Navigate to your Windows Control Panel > Credential Manager > Windows CredentialsĢ. Method 2: Update the mailbox in Credential Manager and re-build the Autodiscover.xml fileġ. Open Outlook and enter your email address and password when prompted. Entry the number 1 in the Value data box, and select OK.ġ0. Name the entry: ExcludeExplicitO365EndPointĦ. Right-click on your new entry and select MODIFY.ħ. In the registry, navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscoverĤ. Right-click anywhere in the right-hand column and choose NEW and then DWORD (32-bit) Value.ĥ. ( HIGHLY RECOMMENDED BUT OPTIONAL) Backup your registry. type regedit in either the Run box or in the Search boxĢ. We strongly recommend that you perform a backup of your registry before making any changes. Note : Incorrectly performed Registry edits can cause Windows to crash.
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