Force Windows 11 to use NetBIOS to discover old SMB 1.0 devices in the LAN. Possible?


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drkh

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Hello,

In my home LAN, there is a Window 11 Pro 24H2 PC and a few old media players which only support NetBIOS and SMB 1.0 under Linux. Any of them, PC or player, can access all the others' shares if I manually provide the UNC names: \\ComputerName or \\DeviceName.

However, in terms of dicovering the devices, the players usually can see the PC, but the PC can never see the players.

On the Windows 11 PC, I have added "SMB 1.0/CIFS File Sharing Support" and enabled SMB 1.0 server and client. In Ethernet adapter settings, NetBIOS over TCP/IP is explicitly selected, i.e., not just Default. In Network Connection Details, it's yes for NetBIOS over TCP/IP.

Also, Network Discovery and File and Printer Sharing are turned on for the Private profile. The following services are all running (though the startup types of some are manual):

Computer Browser
Function Discovery Provider Host
Function Discovery Resource Publication
Server (Automatic
SSDP Discovery
TCP/IP NetBIOS Helper
Worktation

I have even tried creating Windows Defender Firewall inbound "Allow" rules for TCP/UDP port 137-139, 445.

But Windows 11 just can not discover those players.

Maybe Windows 11 (esp. 24H2) just doesn't want to use NetBIOS any more?

If so, can we force NetBIOS for Windows 11 in its discovery endeavor?
 
Last edited:

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drkh said:
Hello,

In my home LAN, there is a Window 11 Pro 24H2 PC and a few old media players which only support NetBIOS and SMB 1.0 under Linux. Any of them, PC or player, can access all the others' shares if I manually provide the UNC names: \\ComputerName or \\DeviceName.

However, in terms of dicovering the devices, the players usually can see the PC, but the PC can never see the players.

On the Windows 11 PC, I have added "SMB 1.0/CIFS File Sharing Support" and enabled SMB 1.0 server and client. In Ethernet adapter settings, NetBIOS over TCP/IP is explicitly selected, i.e., not just Default. In Network Connection Details, it's yes for NetBIOS over TCP/IP.

Also, Network Discovery and File and Printer Sharing are turned on for the Private profile. The following services are all running (though the startup types of some are manual):

Computer Browser
Function Discovery Provider Host
Function Discovery Resource Publication
Server (Automatic
SSDP Discovery
TCP/IP NetBIOS Helper
Worktation

I have even tried creating Windows Defender Firewall inbound "Allow" rules for TCP/UDP port 137-139, 445.

But Windows 11 just can not discover those players.

Maybe Windows 11 (esp. 24H2) just doesn't want to use NetBIOS any more?

If so, can we force NetBIOS for Windows 11 in its discovery endeavor?
Click to expand...
On most modern Linux distros Netbios is deprecated.

Incidently to use SMB1 the global setting in the Linux samba (/etc/samba/smb.conf) file needs to be set to "min protocol=NT1" for it to access Windows machines on SMB1.

Windows machines usually have no trouble accessing Linux systems but you might now have to access them via its IP address rather than Hostname.

But if you can avoid SMB1 it's worth it. Only really old devices need SMB1 now.

Cheers
jimbo
 

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jimbo45 said:
Windows machines usually have no trouble accessing Linux systems but you might now have to access them via its IP address rather than Hostname.
Click to expand...

May I infer from your remark that in terms of network discovery, Windows 11 now has no way to discover those old media players? And, if so, I can't help but wonder why NetBIOS and SMB 1.0 still exist in Windows 11 since both have been deprecated.

Actually, if I type the UNC names of those old media players, e.g., \\player_1, into the address field of Windows 11 File Explorer. the shares of those players can always be accessed. So, Windows 11 has no problem accessing the players, and vice versa. Additionally, those players can discover the Windows 11 PC almost always.
 

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Windows 11 Pro 24H2 build 26100.4349Intel Core i5-12600K2 x ADATA XPG GAMMIX D10 DDR4 16GB(iGPU) Intel UHD Graphics 770
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drkh said:
May I infer from your remark that in terms of network discovery, Windows 11 now has no way to discover those old media players? And, if so, I can't help but wonder why NetBIOS and SMB 1.0 still exist in Windows 11 since both have been deprecated.

Actually, if I type the UNC names of those old media players, e.g., \\player_1, into the address field of Windows 11 File Explorer. the shares of those players can always be accessed. So, Windows 11 has no problem accessing the players, and vice versa. Additionally, those players can discover the Windows 11 PC almost always.
Click to expand...
Can you not just use the UNC names to map a network drive for easier access? I find that the easiest way to make Windows co-operate. I have several network shares for my (linux based) NAS and I have mapped one of the folders using the UNC name. The other folders are pinned to start menu and just show up. (But this is all for one device - you would need to map each device.)
 

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Senecio said:
Can you not just use the UNC names to map a network drive for easier access? I find that the easiest way to make Windows co-operate. I have several network shares for my (linux based) NAS and I have mapped one of the folders using the UNC name. The other folders are pinned to start menu and just show up. (But this is all for one device - you would need to map each device.)
Click to expand...
Yes, I agree and can do that. I just don't understand why Windows 11 can't discover those old players using NetBIOS and SMB 1.0 when everything looks well-configured. Maybe it's because Window 11 needs to be forced to do that in some way?
 

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I can't explain the intricacies of Windows 11 networking - I assume it's associated with improving security. I would however reinforce @jimbo45 comment about the undesirability of using SMB 1.0 - it has been a security risk for years.
 

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Senecio said:
I can't explain the intricacies of Windows 11 networking - I assume it's associated with improving security. I would however reinforce @jimbo45 comment about the undesirability of using SMB 1.0 - it has been a security risk for years.
Click to expand...
Thank you for providing a reminder. I think it's alright because the LAN is a very simple network with no important items. Thank you again.
 

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i have this trouble with a old wd nas. windows dont see it but wd access does
 

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For security reasons, 24H2 disables the fallback for insecure guest logons.
Enable or Disable Require SMB Client Encryption in Windows 11

Run these PowerShell commands as Administrator:
Code: 
Set-SmbClientConfiguration -RequireSecuritySignature $false -confirm:$false
Set-SmbClientConfiguration -EnableInsecureGuestLogons $true -confirm:$false
 

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thank you i give it a shot
 

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thank you it worked
 

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I have EXACTLY the same issues after the recent Windows update on BOTH Windows 10 and 11 pro ,
it is the same on 2 other PC's , same models similar specs .

I am accessing a USB drive on my Archer VR900v2 which is Samba/SMB 1 :

UNC ( \\Computername\Share ) or IP ADDRESS if I search in the address bar in EXPLORER
will give me the share and access fine BUT the NETWORK also known as NETWORK NEIGHBOURHOOD, NETWORK PLACES
in EXPLORER refuses to show the share.

Interestingly if I open NETWORK , I can see other PC's but not the share on the VR900v2 , if I then use a
QUICK link from the left menu to the VR900v2 it goes straight to the share and then even appears in the folder tree
on the left side of screen under NETWORK , but never appears in the NETWORK NEIGHBOURHOOD Screen/Folder.

The reason is the NETWORK folder has stopped showing under DISCOVERY METHOD any NetBIOS shares ?

How can I make the Network folder show NetBIOS under the DISCOVERY METHOD ?

Please do not remind me that SMB 1 has security issues , I know about them and they are allowed for
but as this is a PRIVATE LAN with 4 PC's and the info on USB share will be irrelevant stuff , I am
not too bothered.

How DISCOVERY was before update.webpDISCOVERY after update.webpNetwork.webp
 
Last edited:

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One of the changes for 24H2.

1758470768550.webp
 

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Thanks for the reply and as I said I am well aware of what enabling SMB 1 on my Home Network envisages .

My FIREWALL rules are all correct , as I said I DO NOT HAVE ANY ACCESS ISSUES with the USB share .

However your reply did not in any way respond to my question of how or why the NetBIOS option
in the drop down in NETWORK DISCOVERY has been removed or how to re enable it .

Please look at the pictures above to understand what my question is .
 

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Discovery Options BEFORE update.webp
 

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