I have set up a SAMBA server on Ubuntu. I set the minimum protocol to SMB2, maximum to SMB3. Now, I can connect to the shared path from Windows, and I want to know which protocol (SMB2 or SMB3) Window is using. Is there any way to know that?

I have searched Google, but all I could find was the enabled versions of SMB on a Windows computer, not the version of SMB currently in use with a specific remote host. Let's say that I have opened a network-shared directory \\mybackup\test\ with File Explorer. Can I know which version of SMB Windows is currently using for mybackup?

1 Answer

Run Get-SmbConnection from PowerShell to list all outgoing SMB connections, together with their "Dialect" (which is how SMB calls the protocol versions).

Get-SmbConnection
Get-SmbConnection -ServerName mybackup

It can also show whether the connection is encrypted, although this is not included by default:

Get-SmbConnection | ft ServerName,ShareName,Dialect,Encrypted,UserName

(Don't confuse this command with Get-SmbSession which is for incoming connections.)

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You can also get this information on the server – Samba has a command smbstatus (requires root), which lists all inbound SMB connections like Get-SmbSession does on Windows.

$ sudo smbstatus
PS> Get-SmbSession | ft ClientComputerName,ClientUserName,Dialect

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