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[MS-SMB2] SMB1 Negotiate and SMB1/CIFS component being disabled

Lilia 80 Reputation points
2025-01-14T14:26:18.9966667+00:00

Trying to understand whether SMB1 Negotiate can be rejected by the Windows Server.

I have the following setup for Server 2025:
"SMB 1.0/CIFS File Sharing Support" listed as "Not installed".

Get-SmbServerConfiguration:

EnableSMB1Protocol : False
Smb2DialectMax : SMB311
Smb2DialectMin : SMB311

Then Windows 11 24H2 client issues SMB1 Negotiate to this server and it's not being rejected.

Does it mean that SMB1 Negotiate is never rejected as long it has 'SMB 2.???' in requested dialects, even if server has SMB1 off?

Windows Open Specifications
Windows Open Specifications
Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.Open Specifications: Technical documents for protocols, computer languages, standards support, and data portability. The goal with Open Specifications is to help developers open new opportunities to interoperate with Windows, SQL, Office, and SharePoint.
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  1. Sreekanth Nadendla 491 Reputation points Microsoft Employee
    2025-01-16T16:14:09.3733333+00:00

    Hello Lilia, your assessment is correct. Supporting details from the specifications are given below.

    From MS-SMB2 section "1.4 Relationship to Other Protocols"

    "The SMB 2 Protocol can be negotiated by using an SMB negotiate, as specified in [MS-SMB] section 1.7."

    Additional details can be found in MS-SMB2 section "1.7 Versioning and Capability Negotiation"

    Regards,

    Sreekanth Nadendla

    Microsoft Open Specifications

    1 person found this answer helpful.
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