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Connection reset upon receiving an SMB 3.1.1 encrypted packet.

立軒 林 20 Reputation points
2023-12-15T07:04:23.5433333+00:00

Hello, everyone.

I am currently working on an SMB client on an embedded RTOS system. When the test servers( Windows 11 & Windows 10) received the encrypted SMB packet from the client, Windows immediately fails the request with a [RST ,ACK] .

I only use the AES-128-CCM encryption algorithm after confirmed in the negotiation response from server, and cross-testing with other conventional application(SAMBA server with my client, 3rd-party client with test servers) all works with no problem, really cannot find obvious clue about the cause of this.

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Accepted answer
  1. Obaid Farooqi MSFT 591 Reputation points Microsoft Employee
    2024-01-08T22:09:31.9833333+00:00

    This issue is now resolved.

    The reason server was disconnecting is that the implementor is using port 139 which is Netbios-over-TCP. Windows client and server do not support encryption on Netbios-over-TCP. This is documented in MS-SMB2 as follows:

    "

    <90> Section 3.1.4.3: Windows-based clients and servers do not encrypt the message if the connection is NetBIOS over TCP

    "

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