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Source facts

\n

Microsoft describes SMBv1 as deprecated and absent from the default installation of modern Windows and Windows Server releases. Connections involving devices that support only SMBv1 can produce connection errors. Microsoft recommends asking the device manufacturer for software or firmware supporting SMBv2.02 or later. Microsoft documentation.

\n

Applicability

\n

Use this review when a particular legacy device fails to connect. Identify the exact device, firmware, Windows endpoint, and observed error. Confirm its supported SMB versions through vendor documentation before assigning the failure to a protocol mismatch.

\n

DSE recommendation

\n

Build an inventory of the specific workflows that depend on the device and have the owner request the supported update path. Preserve error evidence and the current protocol requirements in the case record. Evaluate vendor-supported replacement or updating with the business owner. Keep the question of a legacy dependency separate from any proposed change to the wider Windows protocol policy.

\n

Verification

\n

After an approved vendor update or replacement, test the original workflow and record the actual supported protocol configuration. Check representative reads and writes where applicable, and retain any continuing error. Confirm that the device owner accepts the result before retiring the legacy dependency record or applying the same approach to another model.

\n

Official references

\n

Microsoft Learn: SMBv1 Not Installed by Default in Windows Server and Windows. Source reviewed September 8, 2026.

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Keep the question of a legacy dependency separate from any proposed change to the wider Windows protocol policy.\nVerification\nAfter an approved vendor update or replacement, test the original workflow and record the actual supported protocol configuration. Check representative reads and writes where applicable, and retain any continuing error. Confirm that the device owner accepts the result before retiring the legacy dependency record or applying the same approach to another model.\nOfficial references\nMicrosoft Learn: SMBv1 Not Installed by Default in Windows Server and Windows. Source reviewed September 8, 2026.", "content_markdown": "## Source facts\n\nMicrosoft describes SMBv1 as deprecated and absent from the default installation of modern Windows and Windows Server releases. Connections involving devices that support only SMBv1 can produce connection errors. Microsoft recommends asking the device manufacturer for software or firmware supporting SMBv2.02 or later. [Microsoft documentation](https://learn.microsoft.com/en-us/windows-server/storage/file-server/Troubleshoot/smbv1-not-installed-by-default-in-windows).\n\n## Applicability\n\nUse this review when a particular legacy device fails to connect. Identify the exact device, firmware, Windows endpoint, and observed error. Confirm its supported SMB versions through vendor documentation before assigning the failure to a protocol mismatch.\n\n## DSE recommendation\n\nBuild an inventory of the specific workflows that depend on the device and have the owner request the supported update path. Preserve error evidence and the current protocol requirements in the case record. Evaluate vendor-supported replacement or updating with the business owner. Keep the question of a legacy dependency separate from any proposed change to the wider Windows protocol policy.\n\n## Verification\n\nAfter an approved vendor update or replacement, test the original workflow and record the actual supported protocol configuration. Check representative reads and writes where applicable, and retain any continuing error. Confirm that the device owner accepts the result before retiring the legacy dependency record or applying the same approach to another model.\n\n## Official references\n\n[Microsoft Learn: SMBv1 Not Installed by Default in Windows Server and Windows](https://learn.microsoft.com/en-us/windows-server/storage/file-server/Troubleshoot/smbv1-not-installed-by-default-in-windows). 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