Policy CSP - ADMX_LanmanWorkstation

Tip

This CSP contains ADMX-backed policies which require a special SyncML format to enable or disable. You must specify the data type in the SyncML as <Format>chr</Format>. For details, see Understanding ADMX-backed policies.

The payload of the SyncML must be XML-encoded; for this XML encoding, there are a variety of online encoders that you can use. To avoid encoding the payload, you can use CDATA if your MDM supports it. For more information, see CDATA Sections.

Pol_CipherSuiteOrder

Scope	Editions	Applicable OS
✅ Device ❌ User	✅ Pro ✅ Enterprise ✅ Education ✅ Windows SE ✅ IoT Enterprise / IoT Enterprise LTSC	✅ Windows 10, version 2004 [10.0.19041.1202] and later ✅ Windows 10, version 2009 [10.0.19042.1202] and later ✅ Windows 10, version 21H1 [10.0.19043.1202] and later ✅ Windows 11, version 21H2 [10.0.22000] and later

./Device/Vendor/MSFT/Policy/Config/ADMX_LanmanWorkstation/Pol_CipherSuiteOrder

This policy setting determines the cipher suites used by the SMB client.

If you enable this policy setting, cipher suites are prioritized in the order specified.

If you enable this policy setting and don't specify at least one supported cipher suite, or if you disable or don't configure this policy setting, the default cipher suite order is used.

SMB 3.11 cipher suites:

AES_128_GCM.

AES_128_CCM.

AES_256_GCM.

AES_256_CCM.

SMB 3.0 and 3.02 cipher suites:

AES_128_CCM.

How to modify this setting:

Arrange the desired cipher suites in the edit box, one cipher suite per line, in order from most to least preferred, with the most preferred cipher suite at the top. Remove any cipher suites you don't want to use.

Note

When configuring this security setting, changes won't take effect until you restart Windows.

[!NOTE]

AES_256 is not supported on Windows 10 version 20H2 and lower. If you enter only AES_256 crypto lines, the older clients will not be able to connect anymore.

Description framework properties:

Property name	Property value
Format	chr (string)
Access Type	Add, Delete, Get, Replace

Tip

This is an ADMX-backed policy and requires SyncML format for configuration. For an example of SyncML format, refer to Enabling a policy.

ADMX mapping:

Name	Value
Name	Pol_CipherSuiteOrder
Friendly Name	Cipher suite order
Location	Computer Configuration
Path	Network > Lanman Workstation
Registry Key Name	Software\Policies\Microsoft\Windows\LanmanWorkstation
ADMX File Name	LanmanWorkstation.admx

Pol_EnableHandleCachingForCAFiles

Scope	Editions	Applicable OS
✅ Device ❌ User	✅ Pro ✅ Enterprise ✅ Education ✅ Windows SE ✅ IoT Enterprise / IoT Enterprise LTSC	✅ Windows 10, version 2004 [10.0.19041.1202] and later ✅ Windows 10, version 2009 [10.0.19042.1202] and later ✅ Windows 10, version 21H1 [10.0.19043.1202] and later ✅ Windows 11, version 21H2 [10.0.22000] and later

./Device/Vendor/MSFT/Policy/Config/ADMX_LanmanWorkstation/Pol_EnableHandleCachingForCAFiles

This policy setting determines the behavior of SMB handle caching for clients connecting to an SMB share where the Continuous Availability (CA) flag is enabled.

• If you enable this policy setting, the SMB client will allow cached handles to files on CA shares. This may lead to better performance when repeatedly accessing a large number of unstructured data files on CA shares running in Microsoft Azure Files.

• If you disable or don't configure this policy setting, Windows will prevent use of cached handles to files opened through CA shares.

Note

This policy has no effect when connecting Scale-out File Server shares provided by a Windows Server. Microsoft doesn't recommend enabling this policy for clients that routinely connect to files hosted on a Windows Failover Cluster with the File Server for General Use role, as it can lead to adverse failover times and increased memory and CPU usage.

Description framework properties:

Property name	Property value
Format	chr (string)
Access Type	Add, Delete, Get, Replace

Tip

This is an ADMX-backed policy and requires SyncML format for configuration. For an example of SyncML format, refer to Enabling a policy.

ADMX mapping:

Name	Value
Name	Pol_EnableHandleCachingForCAFiles
Friendly Name	Handle Caching on Continuous Availability Shares
Location	Computer Configuration
Path	Network > Lanman Workstation
Registry Key Name	Software\Policies\Microsoft\Windows\LanmanWorkstation
Registry Value Name	EnableHandleCachingForCAFiles
ADMX File Name	LanmanWorkstation.admx

Pol_EnableOfflineFilesforCAShares

Scope	Editions	Applicable OS
✅ Device ❌ User	✅ Pro ✅ Enterprise ✅ Education ✅ Windows SE ✅ IoT Enterprise / IoT Enterprise LTSC	✅ Windows 10, version 2004 [10.0.19041.1202] and later ✅ Windows 10, version 2009 [10.0.19042.1202] and later ✅ Windows 10, version 21H1 [10.0.19043.1202] and later ✅ Windows 11, version 21H2 [10.0.22000] and later

./Device/Vendor/MSFT/Policy/Config/ADMX_LanmanWorkstation/Pol_EnableOfflineFilesforCAShares

This policy setting determines the behavior of Offline Files on clients connecting to an SMB share where the Continuous Availability (CA) flag is enabled.

• If you enable this policy setting, the "Always Available offline" option will appear in the File Explorer menu on a Windows computer when connecting to a CA-enabled share. Pinning of files on CA-enabled shares using client-side caching will also be possible.

• If you disable or don't configure this policy setting, Windows will prevent use of Offline Files with CA-enabled shares.

Note

Microsoft doesn't recommend enabling this group policy. Use of CA with Offline Files will lead to very long transition times between the online and offline states.

Description framework properties:

Property name	Property value
Format	chr (string)
Access Type	Add, Delete, Get, Replace

Tip

This is an ADMX-backed policy and requires SyncML format for configuration. For an example of SyncML format, refer to Enabling a policy.

ADMX mapping:

Name	Value
Name	Pol_EnableOfflineFilesforCAShares
Friendly Name	Offline Files Availability on Continuous Availability Shares
Location	Computer Configuration
Path	Network > Lanman Workstation
Registry Key Name	Software\Policies\Microsoft\Windows\LanmanWorkstation
Registry Value Name	AllowOfflineFilesforCAShares
ADMX File Name	LanmanWorkstation.admx

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