Outook 2010 Wanting Security Key Again

A very common problem is when Outlook  starts asking for the user credentials, even if the right password is specified. It looks similar this: afterward starting Outlook successfully connects to the on-premises Exchange server (or Office 365 mailbox), the user sees a listing of folders in the mailbox and new emails in the Inbox. But after a few minutes of normal work, a window appears for entering the user proper noun and password. The user enters the password and presses OK, but the window with the prompt to enter the credentials appears over again. By clicking the "Cancel" button, the user can continue to piece of work with Outlook, but after a while the window asking for the password pops up again (sometimes the user account may be locked at the same time).  The problem occurs in different versions of Outlook (2019/2016/365) and Windows (there was a problem in both Windows vii/eight.one and Windows ten).

Near admins in this case try to recreate the mail contour, reinstall Office – but this normally does not help. Outlook with some periodicity still requires the user to enter a countersign.

Consider several ways that tin can assistance you to remove the annoying password request window in Outlook.

Outset of all, of course, you demand to make sure that the user enters the correct countersign, and didn't forget it :).

Also, try to connect to your mailbox through the spider web interface (OWA) and log in. Perchance the problem is that the user password has expired (the password has expired according to the domain password policy settings) and must be changed.

Contents:

• Clear Saved Outlook Credentials
• Disable "Ever Prompt for Credentials" Option in Outlook
• Outlook Anywhere and NTLM authentication
• Outlook: Disable Part 365 Autodiscover
• Change Part 365 User Authentication Method
• Recreate Your Outlook Profile
• Temporary Disable Your Anti-virus and Firewall Protection
• Poor Network Connection to Exchange Server

Clear Saved Outlook Credentials

Cheque if you have Outlook saved passwords stored in the Windows Password Manager (Credential Director), try to delete them all. To do this, go to Control Panel\All Control Panel Items\User Accounts\Manage your credential -> Windows Credentials. Find the saved passwords for Outlook/Function in the Generic Credentials list and remove them.

To directly admission Credential Manager, run the command:

rundll32.exe keymgr.dll,KRShowKeyMgr

Disable "Ever Prompt for Credentials" Selection in Outlook

Open your Outlook Account Settings (File -> Account Settings -> Account Settings), double click on your Exchange business relationship. Go to More than settings -> select Security tab. Clear the checkbox Always prompt for credentials in the User identification section.

If you accept an Office 365 mailbox connected, this tab should take an boosted "Logon network security" field. Brand sure that "Anonymous Hallmark" is not selected.

Outlook Anywhere and NTLM hallmark

If your Outlook is configured to admission the Substitution mailbox using Outlook Anywhere (MAPI over HTTP), verify that NTLM hallmark is used. At the same time, you lot need to check the authentication type used for the IIS site on the Exchange server.
If the reckoner with a problem Outlook is not joined to the Active Directory domain, then on the opposite, you should endeavour to switc from NTLM authentication to Basic.

Outlook: Disable Office 365 Autodiscover

Somewhere in the autumn of 2016, an update was released for Outlook 2016 that enabled a mandatory cheque of the Office 365 deject connection point. Yous tin verify this past using the Fiddler or TCPView tools and track the attempts to connect to the autodiscover-due south.outlook.com and outlook.office365.com servers.

To disable this cheque, get to the registry key HKEY_CURRENT_USER\Software \Microsoft\Part\xvi.0\Outlook\AutoDiscover and create new DWORD parameter named ExcludeExplicitO365Endpoint and value 1. Restart Outlook.

The ExcludeExplicitO365Endpoint registry parameter is applicable to Outlook 2016 version 16.0.6741.2017 and newer (this parameter is additional to the list of parameters that decide the types of Autodiscover processes when Outlook starts:

You lot can make changes to the registry with the following command:

reg add HKEY_CURRENT_USER\Software\Microsoft\Part\10.0\Outlook\AutoDiscover /t REG_DWORD /v ExcludeExplicitO365Endpoint /d 1
Or, using the PowerShell cmdlet Set up-ItemProperty:
Set-ItemProperty -Path "HKCU:\Software\Microsoft\Office\sixteen.0\Outlook\AutoDiscover" -Name 'ExcludeExplicitO365Endpoint' -Value ane -Type DWORD –Force

Change Office 365 User Hallmark Method

If your mailbox has been migrated from on-premises Exchange to Function 365 or you have two mailboxes connected in Outlook (ane from the on-bounds Exchange, the second from Role 365) and you use an RPC connection, in this case Outlook doesn't use Mod Hallmark (also used for MFA). In this case, your credentials are sent to Role 356 instead of token. To force Outlook to utilise Modern Hallmark for RPC connections, you need to add the AlwaysUseMSOAuthForAutoDiscover DWORD parameter with the value 1 to the registry key HKCU\Software\Microsoft\Substitution.

Ready-ItemProperty -Path " HKCU:\Software\Microsoft\Exchange" -Name 'AlwaysUseMSOAuthForAutoDiscover' -Value one -Type DWORD -Forcefulness

Ensure that a Modern Authentication is enabled for your Part 365 account in the Office 365 Admin Center (Settings -> Services & add-ins).

If on the contrary you want to completely disable Modern Authentication in Outlook 2016/2019/365 (this authentication method should exist disabled in the Admin Center), you lot demand to configure the post-obit registry settings:

This method should help to gear up issues with constantly requested credentials in Outlook 2016/2019 with Office 365 mailbox connected.

Set-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Role\16.0\Mutual\Identity" -Name EnableAdal -Value 0 -Type DWORD –Force
Set-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Office\16.0\Common\Identity" -Name DisableADALatopWAMOverride -Value one -Blazon DWORD –Force
Set-ItemProperty -Path "HKCU:\SOFTWARE\Microsoft\Office\sixteen.0\Common\Identity" -Name DisableAADWAM -Value ane -Type DWORD –Force

Recreate Your Outlook Profile

If all of these methods above did not help you go rid of the trouble, try to delete and recreate your Outlook profile. You can create a new Outlook contour using the Mail service icon in the Control Panel or using the outlook.exe /manageprofiles command.

If the Post app icon is missing in Control Panel, it can be restored this way.

Temporary Disable Your Anti-virus and Firewall Protection

Perchance the Exchange connection problem is caused by your anti-virus or firewall software. Effort to temporarily disable information technology and check whether Outlook continues to prompts a countersign.

Poor Network Connection to Exchange Server

A poor and unstable network connection to the Exchange server and/or domain controller can besides be a source of periodic password requests in Outlook. You tin can test the network operation using the iperf tool.

As well check the estimator time, it should differ from the time on the domain controller for no more than than five minutes. If more, check the NTP time synchronization scheme in your domain.

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Source: http://woshub.com/outlook-keeps-prompting-credentials/