How to detect, enable and disable SMBv1, SMBv2, and SMBv3 in Windows.; 8 minutes to read +1; In this article Summary. This article describes how to enable and disable Server Message Block (SMB) version 1 (SMBv1), SMB version 2 (SMBv2), and SMB version 3 (SMBv3) on the SMB client and server components. Below are suggested parameters to use in smb.conf file of the Samba server to improve operability with Mac OS X clients. Note that some parameters may not work with your version of Samba - read the smb.conf and vfsfruit man pages (on Linux) for your system.
Samba is a handy open source and multi-platform utility that makes it easy for system and network administrators to easily setup, configure and use various systems and equipment. Helps you gain access to print and file services. Samba delivers file and print services for different Microsoft Windows clients. Add username and password explicitely into the Cmd+K connect to server dialog: smb://myusername:mypassword@192.168.1.2/MyFiles; I assume this is a macOS SMB client issue. This issue will go away with reboot. I'd like to fix the issue without restarting macOS – how can I restart SMB.
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-->Applies to: Windows 10, Windows 8.1, Windows 8, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows Server 2012
This article describes how to enable and disable Server Message Block (SMB) version 1 (SMBv1), SMB version 2 (SMBv2), and SMB version 3 (SMBv3) on the SMB client and server components.
While disabling or removing SMBv1 might cause some compatibility issues with old computers or software, SMBv1 has significant security vulnerabilities and we strongly encourage you not to use it.
Disabling SMBv2 or SMBv3 for troubleshooting
While we recommend that you keep SMBv2 and SMBv3 enabled, you might find it useful to disable one temporarily for troubleshooting, as described in How to detect status, enable, and disable SMB protocols on the SMB Server.
In Windows 10, Windows 8.1, and Windows 8, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, and Windows Server 2012, disabling SMBv3 deactivates the following functionality (and also the SMBv2 functionality that's described in the previous list):
- Transparent Failover - clients reconnect without interruption to cluster nodes during maintenance or failover
- Scale Out – concurrent access to shared data on all file cluster nodes
- Multichannel - aggregation of network bandwidth and fault tolerance if multiple paths are available between client and server
- SMB Direct – adds RDMA networking support for very high performance, with low latency and low CPU utilization
- Encryption – Provides end-to-end encryption and protects from eavesdropping on untrustworthy networks
- Directory Leasing - Improves application response times in branch offices through caching
- Performance Optimizations - optimizations for small random read/write I/O
In Windows 7 and Windows Server 2008 R2, disabling SMBv2 deactivates the following functionality:
- Request compounding - allows for sending multiple SMB 2 requests as a single network request
- Larger reads and writes - better use of faster networks
- Caching of folder and file properties - clients keep local copies of folders and files
- Durable handles - allow for connection to transparently reconnect to the server if there is a temporary disconnection
- Improved message signing - HMAC SHA-256 replaces MD5 as hashing algorithm
- Improved scalability for file sharing - number of users, shares, and open files per server greatly increased
- Support for symbolic links
- Client oplock leasing model - limits the data transferred between the client and server, improving performance on high-latency networks and increasing SMB server scalability
- Large MTU support - for full use of 10-gigabye (GB) Ethernet
- Improved energy efficiency - clients that have open files to a server can sleep
The SMBv2 protocol was introduced in Windows Vista and Windows Server 2008, while the SMBv3 protocol was introduced in Windows 8 and Windows Server 2012. For more information about the capabilities of SMBv2 and SMBv3 capabilities, see the following articles:
How to remove SMB v1
Here's how to remove SMBv1 in Windows 10, Windows 8.1, Windows Server 2019, Windows Server 2016, and Windows 2012 R2.
PowerShell methods
SMB v1 (client and server)
Detect:
Disable:
Enable:
Windows Server 2012 R2, Windows Server 2016, Windows Server 2019: Server Manager method for disabling SMB
SMB v1
Windows 8.1 and Windows 10: PowerShell method
SMB v1 Protocol
Detect:
Disable:
Enable:
SMB v2/v3 Protocol (only disables SMB v2/v3 Server)
Detect:
Disable:
Enable:
Windows 8.1 and Windows 10: Add or Remove Programs method
How to detect status, enable, and disable SMB protocols on the SMB Server
For Windows 8 and Windows Server 2012
Windows 8 and Windows Server 2012 introduce the new Set-SMBServerConfiguration Windows PowerShell cmdlet. The cmdlet enables you to enable or disable the SMBv1, SMBv2, and SMBv3 protocols on the server component.
Note
When you enable or disable SMBv2 in Windows 8 or Windows Server 2012, SMBv3 is also enabled or disabled. This behavior occurs because these protocols share the same stack.
You do not have to restart the computer after you run the Set-SMBServerConfiguration cmdlet.
SMB v1 on SMB Server
Detect:
Disable:
Enable:
For more information, see Server storage at Microsoft.
SMB v2/v3 on SMB Server
Detect:
Download mbox 2 pro driver for mac. Disable:
Enable:
For Windows 7, Windows Server 2008 R2, Windows Vista, and Windows Server 2008
To enable or disable SMB protocols on an SMB Server that is running Windows 7, Windows Server 2008 R2, Windows Vista, or Windows Server 2008, use Windows PowerShell or Registry Editor.
PowerShell methods
Note
This method requires PowerShell 2.0 or later version of PowerShell.
SMB v1 on SMB Server
Detect:
Default configuration = Enabled (No registry key is created), so no SMB1 value will be returned
Disable:
Enable:
Note You must restart the computer after you make these changes.For more information, see Server storage at Microsoft.
SMB v2/v3 on SMB Server
Detect:
Disable:
Enable:
Note
You must restart the computer after you make these changes.
Registry Editor
Important
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
To enable or disable SMBv1 on the SMB server, configure the following registry key:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesLanmanServerParameters
To enable or disable SMBv2 on the SMB server, configure the following registry key:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesLanmanServerParameters
Note
You must restart the computer after you make these changes.
How to detect status, enable, and disable SMB protocols on the SMB Client
For Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012
Note
When you enable or disable SMBv2 in Windows 8 or in Windows Server 2012, SMBv3 is also enabled or disabled. This behavior occurs because these protocols share the same stack.
SMB v1 on SMB Client
Detect
Disable:
Enable:
For more information, see Server storage at Microsoft
SMB v2/v3 on SMB Client
Detect:
Disable:
Enable:
Note
- You must run these commands at an elevated command prompt.
- You must restart the computer after you make these changes.
Disable SMBv1 Server with Group Policy
This procedure configures the following new item in the registry:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesLanmanServerParameters
- Registry entry: SMB1
- REG_DWORD: 0 = Disabled
To configure this by using Group Policy, follow these steps:
Open the Group Policy Management Console. Right-click the Group Policy object (GPO) that should contain the new preference item, and then click Edit.
In the console tree under Computer Configuration, expand the Preferences folder, and then expand the Windows Settings folder.
Right-click the Registry node, point to New, and select Registry Item.
Spss for mac 24. In the New Registry Propertiesdialog box, select the following:
- Action: Create
- Hive: HKEY_LOCAL_MACHINE
- Key Path: SYSTEMCurrentControlSetServicesLanmanServerParameters
- Value name: SMB1
- Value type: REG_DWORD
- Value data: 0
This disables the SMBv1 Server components. This Group Policy must be applied to all necessary workstations, servers, and domain controllers in the domain.
Note
WMI filters can also be set to exclude unsupported operating systems or selected exclusions, such as Windows XP.
Important
Be careful when you make these changes on domain controllers on which legacy Windows XP or older Linux and third-party systems (that do not support SMBv2 or SMBv3) require access to SYSVOL or other file shares where SMB v1 is being disabled.
Disable SMBv1 Client with Group Policy
To disable the SMBv1 client, the services registry key needs to be updated to disable the start of MRxSMB10 and then the dependency on MRxSMB10 needs to be removed from the entry for LanmanWorkstation so that it can start normally without requiring MRxSMB10 to first start.
This will update and replace the default values in the following two items in the registry:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetservicesmrxsmb10
Registry entry: Start REG_DWORD: 4= Disabled
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesLanmanWorkstation
Registry entry: DependOnService REG_MULTI_SZ: 'Bowser','MRxSmb20″,'NSI'
Note
Smb Client For Macos
The default included MRxSMB10 which is now removed as dependency.
To configure this by using Group Policy, follow these steps:
Open the Group Policy Management Console. Right-click the Group Policy object (GPO) that should contain the new preference item, and then click Edit.
In the console tree under Computer Configuration, expand the Preferences folder, and then expand the Windows Settings folder.
Right-click the Registry node, point to New, and select Registry Item.
In the New Registry Properties dialog box, select the following:
- Action: Update
- Hive: HKEY_LOCAL_MACHINE
- Key Path: SYSTEMCurrentControlSetservicesmrxsmb10
- Value name: Start
- Value type: REG_DWORD
- Value data: 4
Then remove the dependency on the MRxSMB10 that was just disabled.
In the New Registry Properties dialog box, select the following:
- Action: Replace
- Hive: HKEY_LOCAL_MACHINE
- Key Path: SYSTEMCurrentControlSetServicesLanmanWorkstation
- Value name: DependOnService
- Value type: REG_MULTI_SZ
- Value data:
- Bowser
- MRxSmb20
- NSI
Note
These three strings will not have bullets (see the following screen shot).
The default value includes MRxSMB10 in many versions of Windows, so by replacing them with this multi-value string, it is in effect removing MRxSMB10 as a dependency for LanmanServer and going from four default values down to just these three values above.
Note
When you use Group Policy Management Console, you don't have to use quotation marks or commas. Just type the each entry on individual lines.
Restart the targeted systems to finish disabling SMB v1.
Auditing SMBv1 usage
To determine which clients are attempting to connect to an SMB server with SMBv1, you can enable auditing on Windows Server 2016, Windows 10, and Windows Server 2019. You can also audit on Windows 7 and Windows Server 2008 R2 if they installed the May 2018 monthly update and on Windows 8, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2 if they installed the July 2017 monthly update.
Enable:
Disable:
Detect:
When SMBv1 auditing is enabled, event 3000 appears in the 'Microsoft-Windows-SMBServerAudit' event log, identifying each client that attempts to connect with SMBv1.
Smb Client For Mac Os 10.13
Summary
If all the settings are in the same Group Policy Object (GPO), Group Policy Management displays the following settings.
Testing and validation
After these are configured, allow the policy to replicate and update. As necessary for testing, run gpupdate /force at a command prompt, and then review the target computers to make sure that the registry settings are applied correctly. Make sure SMB v2 and SMB v3 is functioning for all other systems in the environment.
Below are suggested parameters to use in smb.conf file of the Samba server to improve operability with Mac OS X clients.Note that some parameters may not work with your version of Samba - read the smb.conf and vfs_fruit man pages (on Linux) for your system.Other than those shown in the [TimeMachineBackup] share below, I recommend you include all parameters in the [Global] section of smb.conf. For ease of copy > paste, a clean smb.conf section is included at the bottom of this page.
Apple extensions ('AAPL') run under SMB2/3 protocol, make that the minimum (probably shouldn't be running SMB1 anyway..) - defaults to SMB2_2 in Samba 4.11+:
Apple extensions require support for extended attributes(xattr) - defaults to yes in Samba 4.9+:
Load in modules (order is critical!) and enable AAPL extensions:
How to store OS X metadata:
For additional setting see the manpage vfs_fruit.
Server icon in Finder (added in Samba 4.5):
Mac Os Smb Server
File cleanup:
For Spotlight backend indexing using Elastisearch (added in Samba 4.12):
See smb.conf for 4.12 for other Elastisearch parameters.Gnome tracker is still available (= tracker) or no indexing (= noindex), the default.
For Time Machine backup share (added in Samba 4.8):
As far as I know, testparm will not validate vfs_fruit parameters. (my server runs an old version of Samba :-), but after you have built your smb.conf, you can check for errors anyway with #: testparm or #: testparm -v (which will give you the defaults as well.
Here is the smb.conf code - NOTE - THIS IS NOT A COMPLETE SMB.CONF!!!
From Finder, connect to your Samba server using 'smb://User@Server'.Note that TM backups over smb may now be possible with your server.Other Mac models can be found in '/System/Library/CoreServices/CoreTypes.bundle/Contents/Info.plist'. Use 'Quick Look', Xcode or plutil to view or convert plist.