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SMBV1 IS NOT INSTALLED BY DEFAULT IN WINDOWS 10 VERSION 1709, WINDOWS SERVER
VERSION 1709 AND LATER VERSIONS
* Article
* 05/18/2023
* 9 contributors
Feedback
IN THIS ARTICLE
1. Summary
2. More Information
3. Additional references
SUMMARY
Since Windows 10 Fall Creators Update and Windows Server, version 1709 (RS3),
the Server Message Block version 1 (SMBv1) network protocol is no
longer installed by default. It was superseded by SMBv2 and later protocols
starting in 2007. Microsoft publicly deprecated the SMBv1 protocol in 2014.
SMBv1 has the following behavior in Windows 10 and Windows Server 2019 and later
versions:
* SMBv1 now has both client and server sub-features that can be uninstalled
separately.
* Windows 10 Enterprise, Windows 10 Education, and Windows 10 Pro for
Workstations no longer contain the SMBv1 client or server by default after a
clean installation.
* Windows Server 2019 and later no longer contains the SMBv1 client or server
by default after a clean installation.
* Windows 10 Home and Windows 10 Pro no longer contain the SMBv1 server by
default after a clean installation.
* Windows 11 doesn't contain the SMBv1 server or client by default after a
clean installation.
* Windows 10 Home and Windows 10 Pro still contain the SMBv1 client by default
after a clean installation. If the SMBv1 client isn't used for 15 days in
total (excluding the computer being turned off), it automatically uninstalls
itself.
* In-place upgrades and Insider flights of Windows 10 Home and Windows 10 Pro
don't automatically remove SMBv1 initially. Windows evaluate the usage of
SMBv1 client and server, and if either of them isn't used for 15 days in
total (excluding the time during which the computer is off), Windows will
automatically uninstall it.
* In-place upgrades and Insider flights of the Windows 10 Enterprise, Windows
10 Education, and Windows 10 Pro for Workstations editions don't
automatically remove SMBv1. An administrator must decide to uninstall SMBv1
in these managed environments.
* Automatic removal of SMBv1 after 15 days is a one-time operation. If an
administrator re-installs SMBv1, no further attempts will be made to
uninstall it.
* The SMB version 2.02, 2.1, 3.0, 3.02, and 3.1.1 features are still fully
supported and included by default as part of the SMBv2 binaries.
* Because the Computer Browser service relies on SMBv1, the service is
uninstalled if the SMBv1 client or server is uninstalled. This means that
Explorer Network can no longer display Windows computers through the legacy
NetBIOS datagram browsing method.
* SMBv1 can still be reinstalled in all editions of Windows 10 and Windows
Server 2016.
* Windows Server virtual machines created by Microsoft for the Azure
Marketplace don't contain the SMB1 binaries & you can't enable SMB1.
Third-party Azure Marketplace VMs may contain SMB1, contact their vendor for
information.
Starting in Windows 10, version 1809 (RS5), Windows 10 Pro no longer contains
the SMBv1 client by default after a clean installation. All other behaviors from
version 1709 still apply.
Note
Windows 10, version 1803 (RS4) Pro handles SMBv1 in the same manner as Windows
10, version 1703 (RS2) and Windows 10, version 1607 (RS1). This issue was fixed
in Windows 10, version 1809 (RS5). You can still uninstall SMBv1 manually.
However, Windows will not automatically uninstall SMBv1 after 15 days in the
following scenarios:
* You do a clean install of Windows 10, version 1803.
* You upgrade Windows 10, version 1607 or Windows 10, version 1703 to Windows
10, version 1803 directly without first upgrading to Windows 10, version
1709.
If you try to connect to devices that support only SMBv1, or if these
devices try to connect to you, you may receive one of the following error
messages:
Output Copy
You can't connect to the file share because it's not secure. This share requires the obsolete SMB1 protocol, which is unsafe and could expose your system to attack.
Your system requires SMB2 or higher. For more info on resolving this issue, see: https://go.microsoft.com/fwlink/?linkid=852747
Output Copy
The specified network name is no longer available.
Output Copy
Unspecified error 0x80004005
Output Copy
System Error 64
Output Copy
The specified server cannot perform the requested operation.
Output Copy
Error 58
When a remote server required an SMBv1 connection from this client, and the
SMBv1 client is installed, the following event is logged. This mechanism audits
the use of SMBv1 and is also used by the automatic uninstaller to set the 15-day
timer of removing SMBv1 because of lack of use.
Output Copy
Log Name: Microsoft-Windows-SmbClient/Security
Source: Microsoft-Windows-SMBClient
Date: Date/Time
Event ID: 32002
Task Category: None
Level: Info
Keywords: (128)
User: NETWORK SERVICE
Computer: junkle.contoso.com
Description:
The local computer received an SMB1 negotiate response.
Dialect:
SecurityMode
Server name:
Guidance:
SMB1 is deprecated and should not be installed nor enabled. For more information, see https://go.microsoft.com/fwlink/?linkid=852747.
When a remote server required an SMBv1 connection from this client, and the
SMBv1 client isn't installed, the following event is logged. This event is to
show why the connection fails.
Output Copy
Log Name: Microsoft-Windows-SmbClient/Security
Source: Microsoft-Windows-SMBClient
Date: Date/Time
Event ID: 32000
Task Category: None
Level: Info
Keywords: (128)
User: NETWORK SERVICE
Computer: junkle.contoso.com
Description:
SMB1 negotiate response received from remote device when SMB1 cannot be negotiated by the local computer.
Dialect:
Server name:
Guidance:
The client has SMB1 disabled or uninstalled. For more information: https://go.microsoft.com/fwlink/?linkid=852747.
These devices aren't likely running Windows. They are more likely running older
versions of Linux, Samba, or other types of third-party software to provide SMB
services. Often, these versions of Linux and Samba are, themselves, no longer
supported.
Note
Windows 10, version 1709 is also known as "Fall Creators Update."
MORE INFORMATION
To work around this issue, contact the manufacturer of the product that supports
only SMBv1, and request a software or firmware update that support SMBv2.02 or a
later version. For a current list of known vendors and their SMBv1 requirements,
see the following Windows and Windows Server Storage Engineering Team Blog
article:
SMBv1 Product Clearinghouse
LEASING MODE
If SMBv1 is required to provide application compatibility for legacy software
behavior, such as a requirement to disable oplocks, Windows provides a new SMB
share flag that's known as Leasing mode. This flag specifies whether a share
disables modern SMB semantics such as leases and oplocks.
You can specify a share without using oplocks or leasing to allow a legacy
application to work with SMBv2 or a later version. To do this, use the
New-SmbShare or Set-SmbShare PowerShell cmdlets together with the -LeasingMode
None parameter.
Note
You should use this option only on shares that are required by a third-party
application for legacy support if the vendor states that it is required. Do not
specify Leasing mode on user data shares or CA shares that are used by Scale-Out
File Servers. This is because the removal of oplocks and leases causes
instability and data corruption in most applications. Leasing mode works only
in Share mode. It can be used by any client operating system.
EXPLORER NETWORK BROWSING
The Computer Browser service relies on the SMBv1 protocol to populate the
Windows Explorer Network node (also known as "Network Neighborhood"). This
legacy protocol is long deprecated, doesn't route, and has limited security.
Because the service can't function without SMBv1, it's removed at the same time.
However, if you still have to use the Explorer Network in home and small
business workgroup environments to locate Windows-based computers, you can
follow these steps on your Windows-based computers that no longer use SMBv1:
1. Start the "Function Discovery Provider Host" and "Function Discovery
Resource Publication" services, and then set them to Automatic (Delayed
Start).
2. When you open Explorer Network, enable network discovery when you're
prompted.
All Windows devices within that subnet that have these settings will now appear
in Network for browsing. This uses the WS-DISCOVERY protocol. Contact your other
vendors and manufacturers if their devices still don't appear in this browse
list after the Windows devices appear. It's possible they have this protocol
disabled or that they support only SMBv1.
Note
We recommend that you map drives and printers instead of enabling this feature,
which still requires searching and browsing for their devices. Mapped resources
are easier to locate, require less training, and are safer to use. This is
especially true if these resources are provided automatically through Group
Policy. An administrator can configure printers for location by methods other
than the legacy Computer Browser service by using IP addresses, Active Directory
Domain Services (AD DS), Bonjour, mDNS, uPnP, and so on.
If you can't use any of these workarounds, or if the application manufacturer
can't provide supported versions of SMB, you can re-enable SMBv1 manually by
following the steps in How to detect, enable and disable SMBv1, SMBv2, and SMBv3
in Windows.
Important
We strongly recommend that you don't reinstall SMBv1. This is because this older
protocol has known security issues regarding ransomware and other malware.
WINDOWS SERVER BEST PRACTICES ANALYZER MESSAGING
Windows Server 2012 and later server operation systems contain a best practices
analyzer (BPA) for file servers. If you've followed the correct online guidance
to uninstall SMB1, running this BPA will return a contradictory warning message:
Output Copy
Title: The SMB 1.0 file sharing protocol should be enabled
Severity: Warning
Date: 3/25/2020 12:38:47 PM
Category: Configuration
Problem: The Server Message Block 1.0 (SMB 1.0) file sharing protocol is disabled on this file server.
Impact: SMB not in a default configuration, which could lead to less than optimal behavior.
Resolution: Use Registry Editor to enable the SMB 1.0 protocol.
Important
You should ignore this specific BPA rule's guidance, it's deprecated. The false
error was first corrected in Windows Server 2022 and Windows Server 2019 in the
2022 April Cumulative Update. We repeat: don't enable SMB 1.0.
ADDITIONAL REFERENCES
* Stop using SMB1
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