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# Guest Access Disabled By Default In Windows 10 for SMB2 protocol
- URL: https://ostreff.info/guest-access-disabled-by-default-in-windows-10-for-smb2/
- Published: 2023-01-31T09:10:10.000Z
- Updated: 2024-05-06T05:46:27.000Z
- Author: Jordan Ostreff
- Tags: #SMB2, #Samba, #Windows

In Windows 10 after version 1709, Windows Server also after version 1709, the SMB2 client no longer allows the following actions:

- Guest account access to a remote server
- Fallback to the Guest account after invalid credentials are provided

SMBv2 has the following behavior in these versions of Windows:

- 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.

### Solution 1

Re-Enable the guest account fallback - Microsoft are updating his [manual](https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/guest-access-in-smb2-is-disabled-by-default?ref=ostreff.info) periodically. In general idea is

1. Go into Local Group Policy Editor
2. Navigate into Administrative Templates - Network - Lanman Workstation.
3. Then the Setting : Enable insecure guest logons has to be set to "Enable".
4. Enable : Allow guest usage and solve the problem
5. Disable : Will not allow guest usage and provide this problem.

![enable insecure guest logons](https://ostreff.info/content/images/2023/01/image2019-8-1_17-26-4.png)

### Solution 2

Change the Samba "map to guest" parameter into configuration file ( smb.conf or smb4.conf ). Standard setting by default is "map to guest = bad user". This setting sets a guest session flag during initial SMB tree connect, and the listed Windows versions can end up failing to establish a session.

When changed to "map to guest = Never", then instead of silently dropping the connection, the Windows client prompts for a password. 

- reload Samba : service smb restart