Connect SMB share in Windows 10

Question

I cannot connect my SMB shares on Windows 10. I get the same error on 2 machines, both fresh installs.

Windows 10 Error Dialogue

Android and Windows 7 can connect just fine. Workgroup is correct. Sambauser has a username and password set on the server.

I tried:

• Adding "AllowInsecureGuestAuth" key to \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters
• Adding "server max protocol=SMB3" to smb.conf on the server
• Connecting with the ip like this "\\192.168.0.55\share"
• Disabling Network Adapter Power Saving
• Start Windows 10 in Diagnostic Mode
• Disable SMB2/3 in Windows, enable SMB1 https://support.microsoft.com/en-us/help/2696547/how-to-enable-and-disable-smbv1,-smbv2,-and-smbv3-in-windows-vista,-windows-server-2008,-windows-7,-windows-server-2008-r2,-windows-8,-and-windows-server-2012

At random the network drive connects. I can browse my files for 10 seconds or so. Then it drops dead again.

Answer 1

On the Windows PC, change HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\LmCompatibilityLevel to 4.

Network security: LAN Manager authentication level is usually set to "Send LM & NTLM - use NTLMv2 session security if negotiated" by Group policies for backup compatibility with older clients.

Changing LmCompatibilityLevel to 4 sets it to "Send NTLMv2 response only".