WinHttpAutoLogonLevel
The automatic logon (auto-logon) policy determines when it is acceptable for WinHTTP to include the default credentials in a request to the server.
You can set this value to L for WINHTTP_AUTOLOGON_SECURITY_LEVEL_LOW, set to M for WINHTTP_AUTOLOGON_SECURITY_LEVEL_MEDIUM, and set to H for WINHTTP_AUTOLOGON_SECURITY_LEVEL_HIGH. The default level is WINHTTP_AUTOLOGON_SECURITY_LEVEL_MEDIUM. For more information about automatic logon policy, see the section for Authentication in WinHTTP.
Windows 8 and Windows Server 2012: This policy requires Windows Installer running on the Windows 8 or Windows Server 2012 and is unavailable on all earlier versions of Windows.
Registry Key
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Installer
Data Type
REG_SZ