- #OUTLOOK MAC KEEPS ASKING FOR PASSWORD FOR ONM INSTALL#
- #OUTLOOK MAC KEEPS ASKING FOR PASSWORD FOR ONM UPDATE#
Uninstall all previous versions of Microsoft Office on your computer, reinstall Outlook (you can install only specific MS Office applications using the Microsoft Office Deployment Tool), and configure a connection to your mailbox.ĭifferent issue but couldn’t find a way to email you, Mr. If more, check the NTP time synchronization in your domain Also, check the computer time, it should not differ from the time on the domain controller for more than 5 minutes. If the computer with a problem Outlook is not joined to the Active Directory domain, then, on the contrary, you should try to switch from NTLM authentication to Basic. At the same time, you need to check the authentication type used for the IIS site on the Exchange server. If your Outlook is configured to access the Exchange mailbox using Outlook Anywhere (MAPI over HTTP), make sure you have NTLM enabled. You can test the network performance with the iperf tool Poor and unstable network connectivity to the Exchange server and/or domain controller can also be a source of periodic password requests in Outlook. Try temporarily disabling it and check if Outlook continues to ask for a password Problems connecting to your mailbox may be caused by your antivirus/firewall rules. You can create a new Outlook profile using the Mail icon in the Control Panel or using the outlook.exe /manageprofiles command. If all of these methods above did not help you get rid of the problem, try to delete and recreate your Outlook profile. If you see the warning The name cannot be matched to a name in the address list when you configure your mailbox in Outlook, make sure that your account is not hidden in the Exchange address list. Set-ItemProperty -Path " HKCU:\Software\Microsoft\Exchange" -Name 'AlwaysUseMSOAuthForAutoDiscover' -Value 1 -Type DWORD -Force To force Outlook to use Modern Authentication for RPC connections, you need to add the AlwaysUseMSOAuthForAutoDiscover DWORD parameter with the value 1 to the registry key HKCU\Software\Microsoft\Exchange. In this case, your credentials are sent to Office 356 instead of a token. In this case, Outlook doesn’t use Modern Authentication (also used for MFA). If your mailbox has been migrated from on-premises Exchange to Microsoft 365 or you have two mailboxes connected in Outlook (one from the on-premises Exchange, the second from Microsoft 365/Exchange Online) and you use an RPC connection. Outlook Prompts for Password After Migrating to Microsoft 365 (EOL) The ExcludeExplicitO365Endpoint registry parameter is applicable to Outlook 20 (this key is in addition to the list of keys that determine how Autodiscover is performed when Outlook starts). Set-ItemProperty -Path "HKCU:\Software\Microsoft\Office\16.0\Outlook\AutoDiscover" -Name 'ExcludeExplicitO365Endpoint' -Value 1 -Type DWORD –Force 
Or, using the PowerShell cmdlet Set-ItemProperty: Reg add HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\AutoDiscover /t REG_DWORD /v ExcludeExplicitO365Endpoint /d 1 You can make changes to the registry with the following command: Go to the registry key HKEY_CURRENT_USER\Software \Microsoft\Office\16.0\Outlook\AutoDiscover and create a new DWORD parameter named ExcludeExplicitO365Endpoint and value 1. You can disable this check for an on-premise Exchange Server. If you are using a non-Office365 mailbox or an on-premises Exchange mailbox, Outlook will try to detect detecting your Microsoft account even though the Autodiscover is not pointed to Microsoft 365. You can verify this by using the Fiddler or TCPView tools to monitor the attempts to connect to the and servers.
#OUTLOOK MAC KEEPS ASKING FOR PASSWORD FOR ONM UPDATE#
Somewhere in the fall of 2016, an update was released for Outlook 2016 that enabled a mandatory check of the connection endpoint in the Microsoft 365 (Office 365) cloud. Make sure Anonymous Authentication is not selected here.ĭisable Office 365 Autodiscover in Outlook
If you have a Microsoft 365 (Office 365) mailbox connected in Outlook, this tab should have an additional field Logon network security. If you are using GPO administrative templates for MS Office, this setting can be configured with the policy parameter Online Content Options = Do not allow Office to Connect to the Internet under the following GPO section: Administrative Templates -> Microsoft Office 2016 -> Tools | Options | General | Service Options -> Online Content.
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