​how Can an Administrator Create a Hidden Shared Folder?

If you cannot open or map network shared folders on your NAS, Samba Linux server, computers with legacy Windows versions (Windows 7/XP/Server 2003) from Windows x or 11, nearly likely the problem is that legacy and insecure versions of the SMB protocol are disabled in the electric current Windows builds (SMB protocol is used in Windows to access shared network folders and files).

Microsoft is systematically disabling legacy and insecure versions of the SMB protocol in all recent versions of Windows. Starting with Windows 10 1709 and Windows Server 2022 (both in Datacenter and Standard editions), the unsafe SMBv1 protocol is disabled by default likewise as anonymous (guest) access to network shared folders.

The specific steps to take depend on the error that appears in Windows when accessing a shared binder, and on the settings of the remote SMB server that hosts the network shares.

Contents:

• Can't Access Shared Folder Because Security Policies Block Unauthenticated Guest Access
• Tin't Connect to the File Share Because Information technology'south Not Secure and Requires the Obsolete SMB1 Protocol
• Windows Cannot Admission Shared Folder: Yous Don't Have Permissions
• Other Fixes: Windows Cannot Access Shared Folders

Can't Admission Shared Binder Considering Security Policies Block Unauthenticated Guest Access

Starting with Windows 10 build 1709 Fall Creators Update (Enterprise and Education editions), users began to mutter that when they tried to open a network shared folder on a neighboring computer, an error appeared:

Restoring Network Connections An error occurs when you endeavor to open a network folder: An error occurred while reconnecting Y: to \\nas1\share Microsoft Windows Network: You tin't admission this shared folder because your arrangement's security policies cake unauthenticated guest access. These policies help protect your PC from unsafe or malicious devices on the network.

Moreover, on other computers with Windows eight.1, Windows 7, or Windows x with a build of up to 1709, the same shared network folders open usually. The signal is that in modern versions of Windows 10 (build 1709+), the guest access to the shared folders using the SMBv2 protocol is disabled by default. Guest (anonymous) means admission to a shared network folder without authentication. When accessing a network binder under a guest account over the SMBv1/v2 protocol, such methods of traffic protection as SMB signing and encryption are non used, which makes your session vulnerable to the MiTM (man-in-the-eye) attacks.

These changes are not applied on Windows 10 Dwelling editions and the network access nether the invitee business relationship is working fine.

If you try to open up a shared network folder using the SMB v2 protocol under the invitee account, the following mistake will announced in the Event Viewer of your reckoner (SMB client):

Log Name: Microsoft-Windows-SmbClient/Security   Source: Microsoft-Windows-SMBClient Event ID: 31017 Rejected an insecure invitee logon.

This error says that your computer (client) blocks non-authenticated access under the Guest account.

In near cases, you lot can face this trouble when accessing old NAS devices (usually invitee access is enabled on them for ease of setup) or when opening shared folders on legacy Windows vii/2008 R2/Windows XP/2003 devices with bearding (invitee) admission enabled (see the tabular array of supported SMB protocol versions in different Windows editions).

Microsoft recommends changing the settings on a remote estimator or NAS device that hosts the shared network folders. It is appropriate to switch the network share to the SMBv3 way. Or configure access with hallmark if only the SMBv2 protocol is supported by the device. This is the most correct and safest fashion to fix the problem.

Disable guest admission on the device where your shared folders are stored:

• NAS devices – disable guest access in the settings of your NAS device (depending on vendor and model);
• Samba server on Linux — if you are sharing a network folder with Samba on Linux, add together the post-obit string to the smb.conf configuration file nether the section [global]: map to invitee = never
  And restrict anonymous access in the shared binder configuration section: guest ok = no
• In Windows, you can enable sharing of network folders and printers with password protection via the Control Panel -> Network and Sharing Center -> Advanced sharing settings. For All Networks in the "Countersign Protected Sharing" section, change the value to the "Turn on password protected sharing". In this case, anonymous (invitee) access to the network shared folders volition exist disabled and y'all volition accept to create local users, grant them access permissions to the shared folders and printers and use these accounts to connect to the shared folders on a remote reckoner.

There is another mode – you can change the settings on your Windows device to allow access to shared network folders under the guest account. This method should be used merely as a temporary workaround (!!!), because access to folders without authentication significantly reduces your computer security.

To enable invitee access from your computer, yous need to use the Group Policy Editor (gpedit.msc). Get to the department: Reckoner Configuration -> Administrative templates -> Network -> Lanman Workstation. Find and enable the policy Enable insecure guest logons.This policy option determines whether the SMB customer will allow an dangerous invitee logon to the SMB server.

Update the Grouping Policy settings in Windows with the control:

gpupdate /force

In Windows ten Home, which does not have a local GPO editor, you tin make a like change through the Registry Editor manually:

HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters "AllowInsecureGuestAuth"=dword:1

Or with these commands:

reg add HKLM\Arrangement\CurrentControlSet\Services\LanmanWorkstation\Parameters /five AllowInsecureGuestAuth /t reg_dword /d 00000001 /f
reg add HKLM\Software\Policies\Microsoft\Windows\LanmanWorkstation /5 AllowInsecureGuestAuth /t reg_dword /d 00000001 /f

Tin't Connect to the File Share Because Information technology's Not Secure and Requires the Obsolete SMB1 Protocol

Another possible problem when accessing a network folder from Windows ten is that merely the SMBv1 protocol version is supported on the server-side. Since the SMBv1 client is disabled by default in Windows x 1709+ when you lot attempt to open up the shared binder or map a network drive, you lot may go an error:

You can't connect to the file share because it's not secure. This share requires the obsolete SMB1 protocol, which is unsafe and could expose your organization to attack. Your system requires SMB2 or college.

The error message clearly shows that the network shared binder but supports the SMBv1 client access protocol. In this case, yous should endeavor to reconfigure the remote SMB device to use at to the lowest degree SMBv2 (the right and safe way).

If you employ Samba server on Linux to share files, you can specify the minimum supported version of SMB protocol in the smb.conf file like this:

[global] server min protocol = SMB2_10 client max protocol = SMB3 client min protocol = SMB2_10 encrypt passwords = true restrict bearding = ii

On Windows seven/Windows Server 2008 R2, you tin disable the SMB one protocol and enable SMBv2 through the registry with the post-obit PowerShell commands:

Set-ItemProperty -Path "HKLM:\Organization\CurrentControlSet\Services\LanmanServer\Parameters" SMB1 -Type DWORD -Value 0 –Forcefulness
Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\LanmanServer\Parameters" SMB2 -Blazon DWORD -Value one –Force

On Windows 8.ane/Windows Server 2022 R2, y'all can disable SMBv1, allow SMBv2 and SMBv3 with the following command (verify that a private or domain profile is used for your network connection):

Disable-WindowsOptionalFeature -Online -FeatureName "SMB1Protocol"
Set-SmbServerConfiguration –EnableSMB2Protocol $true

If your network device (NAS, Windows XP, Windows Server 2003) supports only the SMB1 protocol, you can enable a separate SMB1Protocol-Client feature on Windows 10/11 or Windows Server. But this is not recommended!!!

If the remote device requires SMBv1 to connect, and this protocol is disabled on your Windows device, an error appears in the Outcome Viewer:

Log Name: Microsoft-Windows-SmbClient/Security Source: Microsoft-Windows-SMBClient Event ID: 32000 Description:  SMB1 negotiate response received from a remote device when SMB1 cannot be negotiated past the local figurer.

Run the elevated PowerShell prompt and verify that the SMB1Protocol-Client is disabled (State: Disabled):

Get-WindowsOptionalFeature -Online -FeatureName SMB1Protocol-Client

Enable the SMBv1 client protocol (a reboot is required):

Enable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol-Customer

Yous can also enable/disable additional features in Windows 10 and 11 from the optionalfeatures.exe. Expand SMB 1.0/CIFS File Sharing Support and enable the SMB i.0/CIFS Client.

On Windows 10 1809 and newer, the SMBv1 client is automatically removed if it has non been used for more than fifteen days (the SMB 1.0/CIFS Automatic Removal component is responsible for this).

In this example, I enabled just the SMBv1 customer. Practice not enable the SMB1Protocol-Server characteristic if your computer is not used by legacy clients as an SMB server to host shared folders.

Afterwards installing the SMBv1 client, you should be able to connect to a shared folder or printer without whatsoever problems. Notwithstanding, you lot should understand this workaround is not recommended, because it reduces the security of your computer.

Windows Cannot Admission Shared Folder: Yous Don't Accept Permissions

When connecting to a shared network folder on a remote computer, an error may announced:

Network Error Windows cannot access \\PC12\Share You practice non accept permission to admission \\PC12\Share. Contact your network administrator to request access.

When this error occurs, you need to:

1. Make sure that the user y'all are using to access the shared binder is granted access permissions on the remote share. Open the properties of the shared folder on the server and make certain your user has at least read permissions. Also,  you can check the share permissions on the remote host using PowerShell:
   Get-SmbShareAccess -Name "tools"
   Then check the NTFS folder permissions:
   go-acl C:\tools\ |fl If necessary, edit the permissions in the folder and/or share backdrop;
2. Make sure yous are using the right username and countersign to access the network folder. If you lot're not prompted for a username and countersign, try removing saved (buried) credentials for remote shares in Windows Credential Managing director. Run the command rundll32.exe keymgr.dll, KRShowKeyMgr and delete cached credentials for the remote reckoner you are trying to access.
   The side by side time you connect to the shared folder, you will be prompted for a username and password. Specify the credentials to admission the network shared folder on the remote figurer. You lot can save information technology in Credential Manager or add it manually.

Other Fixes: Windows Cannot Access Shared Folders

This section provides additional ways to troubleshoot a problem opening network folders in Windows:

marshallahmand1991.blogspot.com

Source: http://woshub.com/cannot-access-smb-network-shares-windows-10-1709/

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