Both of these authentication methods provide access to SQL Server 2008 and its resources. Lets first examine the differences between the two authentication modes. Windows Authentication Mode ...

According to Redmond, these authentication issues impact both client (Windows 11, version 24H2) and server (Windows Server 2025) platforms, albeit only in some niche scenarios.

In April, Microsoft fixed another known issue causing auth problems on Windows 11 and Windows Server 2025 systems using the Kerberos PKINIT security protocol when Credential Guard is enabled.

Windows and Windows Server come with the SMB server enabled. NTLM refers to the NT Lan Manager (NTLM) protocol for client-sever authentication with, for example, Active Directory (AD) NTLM logons.