The SMB2 ERROR Response packet is sent by the server torespond to a request that has failed or encountered an error. This response iscomposed of an SMB2 PacketHeader (section 2.2.1) followed by this response structure.
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1 0
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9
2 0
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3 0
1
StructureSize
ErrorContextCount
Reserved
ByteCount
ErrorData (variable)
...
StructureSize (2 bytes): The server MUST setthis field to 9, indicating the size of the response structure, not includingthe header. The server MUST set it to this value regardless of how long ErrorData[]actually is in the response being sent.
ErrorContextCount (1 byte): This field MUST beset to 0 for SMB dialects other than 3.1.1. For the SMB dialect 3.1.1, if thisfield is nonzero, the ErrorData field MUST be formatted as avariable-length array of SMB2 ERROR Context structures containing ErrorContextCountentries.
Reserved (1 byte): This field MUST NOT be usedand MUST be reserved. The server MUST set this to 0, and the client MUST ignoreit on receipt.
ByteCount (4 bytes): The number of bytes ofdata contained in ErrorData[].
ErrorData (variable): A variable-length datafield that contains extended error information. If the ErrorContextCountfield in the response is nonzero, this field MUST be formatted as avariable-length array of SMB2 ERROR Context structures as specified insection 2.2.2.1. Each SMB2ERROR Context MUST start at an 8-byte aligned boundary relative to thestart of the SMB2 ERROR Response. Otherwise, it SHOULD<5> be formatted as specified insection 2.2.2.2.
To enable SMBv2, you want to confirm your operating system can run it. Most Windows 10 operating systems can. Open the Powershell and type in Get-SmbServerConfiguration | Select EnableSMB2Protocol. You should receive a True in response, meaning you can run SMB2 on your computer.
Type regedit in the "Open" field and click OK.Add a REG_DWORD key with the name of Smb2.Set the value to 0 to disable SMB2, or set it to 1 to re-enable SMB2.
Windows Vista/Server 2008 and later operating systems use SMB2 when communicating with other machines also capable of using SMB2. SMB1 continues in use for connections with older versions of Windows, as well various vendors' NAS solutions.
Is it safe to disable SMB v2/v3 in Windows Server? In some situations, one may desire to disable SMB v2/v3 protocols in order to harden their systems. The immediate question is: Is this safe? As per Microsoft, "...we recommend that you do not disable SMBv2 or SMBv3.
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