Microsoft Open Specifications Support Team Blog

The official blog of the Engineers supporting the Microsoft Open Specifications Documentation

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  • Blog Post: Extended DFS referral for SMB 3

    This blog talks about site-aware DFS referral introduced in Windows Server 2012. Extended DFS referrals provide remote client computers with optimal DFS referrals when the computers connect to the corporate network by using DirectAccess. This blog also describes how to configure a Window 8 client to...
  • Blog Post: SMB 2.x and SMB 3.0 Timeouts in Windows

    This blog talks about common timeouts for SMB dialects 2.x and 3.0 [MS-SMB2] in Windows. It also covers continuous availability timeout, witness keep alive [MS-SWN], and some SMB-Direct timers [MS-SMBD]. The behaviors are generally version-specific and therefore may change in future Windows releases...
  • Blog Post: CIFS and SMB Timeouts in Windows

    This blog gives a consolidated overview of the most common SMB timeouts in Windows and their behaviors. Some of these legacy timeouts or timers are optional, implementation specific, not defined or not required by the protocol specifications. Let’s recall that MS-CIFS documents the protocol implemented...
  • Blog Post: Encryption in SMB 3.0: A protocol perspective

    Encryption is one of the new SMB 3.0 security enhancements in Windows Server 2012 RTM. It can be enabled on a per-share basis, or enforced for all shares on the server. SMB 3.0 uses AES-CCM [RFC5084] as encryption algorithm, and this also provides data integrity (signing). This blog takes a protocol...
  • Blog Post: SMB3 Secure Dialect Negotiation

    This blog talks about secure dialect negotiation, one of the new SMB3 security enhancements in Windows Server 2012. Secure dialect negotiation is introduced in SMB3 to protect against man-in-the-middle attempt to downgrade dialect negotiation. The idea is to prevent an eavesdropper from downgrading...
  • Blog Post: Notes on sparse files and file sharing

    Sparse files are generally referred to as files, often large, that contain only a small amount of nonzero data relative to their size. In this blog, I would like to chat about sparse files on Windows operating systems and the related SMB commands. From an inter-operability perspective, I intend to discuss...
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