Microsoft wants to bulk up the security in Windows Pro editions by ensuring the SMB insecure guest authentication fallbacks are no longer the default setting in the operating system. The move, which is included in the Windows 11 Insider Preview Build 25276 released this month, means that systems with Windows 10 version 1709 or later and Windows Server 2019, SMB2, and SMB3 will no longer allow by default guest account access to a remote server or for those who provide invalid credentials to fall back to the guest account.

Read full article on The Register