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To review, open the file in an editor that reveals hidden Unicode characters. If the secpol.msc control described in the instructions above is missing, you can make this change directly in the registry.This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Set the LAN Manager authentication level to NTLMv2 response.Security Settings, Local Policies, Security Options. Find "Network Security: LAN Manager authentication level", which is located in.The Local Security Policy console will appear.

In Windows 8.x or Windows Server 2012, swipe down from the upper right corner, select Search, enter secpol.msc, and press Enter.In Windows 10 or Windows Server 2016, use the search function from the Taskbar.Via search: Search for the secpol.msc application and launch it.Double-click Administrative Tools, and then Local From the Control Panel: Navigate to the Control Panel.Open the Local Security Policy console, using one of the following methods:.To use the local security settings to force Windows to use NTLMv2: The registry option will work on all versions of Windows. It is usually found on business-class versions of Windows (for example, Enterprise and Ultimate). Using the Local Security Policy console is easier, but not all versions of Windows include the secpol.msc application necessary to use this method. You only need to use one of the following methods. Windows 8.x and later and Windows Server use NTLMv2 authentication by default, but in rare instances, this setting may become incorrect, even if the NTLM setting was previously correct.

If the NTLM authentication setting on your Windows computer is not set to NTLMv2, your computer may repeatedly prompt you for your IU username and passphrase when you attempt to access your IU Exchange account via Outlook (or any other desktop email client).
