Beginning in ONTAP 9.4, you can enable SMB version 2.0to connect to a domain controller. Doing so is necessary if you havedisabled SMB 1.0 on domain controllers. Beginning in ONTAP 9.4, SMB2is enabled by default.
About this task
The smb2-enabled-for-dc-connections commandoption enables the system default for the release of ONTAP you areusing. The system default for ONTAP 9.4 and higher is disabled forSMB 1.0 and enabled for SMB 2.0. If the domain controller cannot negotiateSMB 2.0 initially, it uses SMB 1.0.
SMB 1.0 can bedisabled from ONTAP to a domain controller.
Note: If -smb1-enabled-for-dc-connections is set to false while -smb1-enabled is set to true, ONTAP denies SMB 1.0 connectionsas the client, but continues to accept inbound SMB 1.0 connectionsas the server. See the topic, Enabling and disabling SMB versions in this guide.
- Before changingSMB security settings, verify which SMB versions are enabled: vserver cifs security show
- Scroll downthe list to see the SMB versions.
- Perform theappropriate command, using the smb2-enabled-for-dc-connections option.
| If you want SMB2 to be... | Enter the command... |
|---|
| Enabled | vserver cifs security modify -vserver vserver_name -smb2-enabled-for-dc-connections true |
| Disabled | vserver cifs security modify -vserver vserver_name -smb2-enabled-for-dc-connections false |
FAQs
Type windows features in the Windows Search box, and select the Turn Windows features on or off option. Once the Windows Features window opens, check the SMB1/CIFS File Sharing Support option, and hit OK. Restart your PC, and check if the problem with SMB2 is resolved.
How do I enable SMB2? ›
To enable SMBv2, you want to confirm your operating system can run it. Most Windows 10 operating systems can. Open the Powershell and type in Get-SmbServerConfiguration | Select EnableSMB2Protocol. You should receive a True in response, meaning you can run SMB2 on your computer.
How to enable SMBv2 signing? ›
Enabling SMB Signing via Group Policy
Within the policy navigate to Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options. There are 4 policy items that can be modified depending on your needs. All of these policy items can either be enabled or disabled.
What is SMB2 enabled for DC connections? ›
The smb2-enabled-for-dc-connections command option enables the system default for the release of ONTAP you are using. The system default for ONTAP 9.4 and higher is disabled for SMB 1.0 and enabled for SMB 2.0. If the domain controller cannot negotiate SMB 2.0 initially, it uses SMB 1.0.
Should SMB2 be disabled? ›
SMB2 is still fine and if disabled may cause some scanners to stop scan to folder and other options (and other devices might stop working as well as most have only just stopped using SMB1). Disable SMB1 first and check the effects. Some equipment such as printers may only work with SMB1 and are not upgradeable.
What is the default port for SMB2? ›
SMB uses either IP port 139 or 445. Port 139: SMB originally ran on top of NetBIOS using port 139. NetBIOS is an older transport layer that allows Windows computers to talk to each other on the same network. Port 445: Later versions of SMB (after Windows 2000) began to use port 445 on top of a TCP stack.
How do I make sure SMB is enabled? ›
Under the More Windows features panel, scroll to the SMB Direct selection and ensure it is checked. You may need to restart your Windows system after performing this change for it to take effect. The SMB 1.0 CIFS File Sharing choice, shown immediately above SMB Direct, should not be enabled.
How to check the SMB version of your network connection? ›
Check SMB version: Verify that the SMB version you enabled is running by running the command "Get-SmbServerConfiguration" in PowerShell. This command will display the SMB version currently configured on your server.
What is the difference between SMB1 and SMB2? ›
For example, SMB2 increased packet sizes to 32-bit — and even 128-bit for file handles — a significant improvement over SMB1's 16-bits. Subcommands for the SMB protocol were reduced from over 100 in SMB1 to less than 20 in SMB2 which reduced the “chattiness” (network noise and bandwidth consumption) SMB1 was known for.
How do I configure SMBv2? ›
To configure SMBv2:
- Run config vpn ssl web portal : config vpn ssl web portal edit portal-name set smb-min-version smbv2 set smb-max-version smbv3 end.
- After running config vpn ssl web portal , configure SSL VPN and firewall policies as usual.
The policies for SMB signing are located in Computer Configuration > Windows Settings > Security Settings > Local Policies > Security Options.
- Microsoft network client: Digitally sign communications (always) ...
- Microsoft network client: Digitally sign communications (if server agrees)
The Server Message Block (SMB) Protocol Versions 2 and 3, hereafter referred to as "SMB 2 Protocol", is an extension of the original Server Message Block (SMB) Protocol (as specified in [MS-SMB] and [MS-CIFS]). Both protocols are used by clients to request file and print services from a server system over the network.
Is SMB2 still used? ›
Windows Vista/Server 2008 and later operating systems use SMB2 when communicating with other machines also capable of using SMB2. SMB1 continues in use for connections with older versions of Windows, as well various vendors' NAS solutions. Samba 3.5 also includes experimental support for SMB2.
Does Windows support SMB2? ›
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 SMBv2 and SMBv3 capabilities, see the following articles: Server Message Block overview. What's New in SMB.
How do I enable SMB2 in Windows 10 CMD? ›
To enable SMB2 on Windows 10, you need to press the Windows Key + S, start typing and click on Turn Windows features on or off. You can also search the same phrase in Start, Settings. Scroll down to SMB 1.0/CIFS File Sharing Support and check that top box.
How to update SMB2 in Windows 10? ›
Microsoft SMB2 Hotfix
- Click Start, type update in the search box, in the list of results click Windows Update.
- Click Check for updates and wait while Windows checks for the latest updates for your computer.
- Under Important Updates, make sure the checkbox beside KB3146706 is checked.
- Click OK, then click Install updates.
The Server Message Block (SMB) Protocol Versions 2 and 3, hereafter referred to as "SMB 2 Protocol", is an extension of the original Server Message Block (SMB) Protocol (as specified in [MS-SMB] and [MS-CIFS]). Both protocols are used by clients to request file and print services from a server system over the network.
How do I enable SMB2 on my NAS? ›
DSM > Control Panel > File Services > SMB > Advanced Settings > General
- Maximum SMB Protocol: SMB3.
- Minimum SMB Protocol: SMB2.
Vulnerabilities in Microsoft Windows SMB2 '_Smb2ValidateProviderCallback()' Vulnerability (MS09-050, Network Check) is a high risk vulnerability that is one of the most frequently found on networks around the world.
