I noticed that I ran into a system error 1272 error to connect to a share residing on my NAS. In Windows 10, version 1709 and higher (also Windows Server versions 1709 and higher) SMB2 guest access is disabled by default.
SMBv2 has the following behavior in Windows 10, version 1709, Windows Server version 1709, and Windows Server 2019:
- Windows 10 Enterprise and Windows 10 Education no longer allow a user to connect to a remote share by using guest credentials by default, even if the remote server requests guest credentials.
- Windows Server 2016 Datacenter and Standard edition no longer allow a user to connect to a remote share by using guest credentials by default, even if the remote server requests guest credentials.
- Windows 10 Home and Professional editions are unchanged from their previous default behavior.
How to enable SMB2 guest access
If you want to enable insecure guest access, you can configure the following Group Policy settings:
Computer configuration\administrative templates\network\Lanman Workstation
“Enable insecure guest logons”
Note By enabling insecure guest logons, this setting reduces the security of Windows clients.