Hotfixes for December 2015

Jeff here, from the SDK team with the Holiday Hotfixes. Happy patching. KB2920591   High CPU usage and performance issues occur when access-based enumeration is enabled in Windows 7 Service Pack 1 or Windows Server 2008 R2 Service Pack 1 KB3084463   WSUSutil.exe csaimport fails upon import in Windows Server 2012 R2 or Windows Server 2012 KB3095319 …

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SHA-1 Code Signing Deprecation in Windows beginning January 1, 2016

This post is to help the product team spread the word on Windows (version 7 and higher) and Windows Server will no longer trust any code that is signed with a SHA-1 code signing certificate and that contains a timestamp value greater than January 1,2016, effective January 1, 2016. For more information or to get…

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Using SHA256 with the SignedXml Class

With the industry moving away from SHA1 including Microsoft (see http://social.technet.microsoft.com/wiki/contents/articles/32288.windows-enforcement-of-authenticode-code-signing-and-timestamping.aspx), many developers should start using SHA2 in their code.  There are resources on the internet that describe how to use SHA256 with SignedXml. This blog is meant to summarize it in one place. First of all, we need to register a SignatureDescription class that defines…


Hotfixes for November 2015

Jeff here from the SDK team. Here are the hotfixes for November 2015. KB3040017   XPS driver is slower than GDI driver to print files in Windows KB3063109   Virtual machine crashes and WAL consistency is not maintained for Guest clustered VMs in Windows Server 2012 R2 KB3078414   NFS service freezes on a Windows Server 2012 cluster…

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Windows Hotfixes for October 2015

Jeff here from the Windows SDK team. Here is the list of October 2015 Hotfixes [Drum roll, please…] KB3030736   “550 The process cannot access the file” error when you try to download a file in Windows KB3044546   An updated reservation may disappear on a DHCP failover cluster in Windows Server 2012 or Windows Server 2012…

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FileSystemWatcher Fencing(Part 2)

  This post is a follow up to the FileSystemWatcher Follies post.  I received a lot of feedback that it would be useful to highlight what would be appropriate to guide against some of the pitfalls that I mentioned in that post.  I’ll cover several of the issues here over a couple of posts and…


Virtual Desktop Switching in Windows 10

  Windows 10 introduces a new concept (for Windows anyway) called Virtual Desktops.  Currently, the guidance for this on MSDN states: The user can group a collection of windows together to create a virtual desktop. Every window is considered to be part of a virtual desktop. When one virtual desktop is hidden, all of the…


Windows Hotfix List for September 2015

Jeff here from the SDK team. It is that time of the month again, here are September’s Hotfixes. Enjoy!     KB3075623   Configuring registry policy processing causes MUP to ignore Group Policy setting in Windows KB3078632   Backup software can’t take server backups in Windows Server 2008 R2 SP1 KB2877115   Error message when you try to…

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Logon as a user without a password

In Windows, it is possible to logon as a different domain user without any credentials.  This is known as a S4U or a Service For User Logon.  This is a Microsoft Extension to Kerberos introduced with Windows Server 2003.  There have been several articles and post on this topic but I thought it would be…

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LogonUser + LOGON32_LOGON_NEW_CREDENTIALS, What is this flag used for?

A new flag was introduced in Windows VISTA for LogonUser(), LOGON32_LOGON_NEW_CREDENTIALS.  https://msdn.microsoft.com/en-us/library/windows/desktop/aa378184(v=vs.85).aspx The remarks say the following for this flag: “This logon type allows the caller to clone its current token and specify new credentials for outbound connections. The new logon session has the same local identifier but uses different credentials for other network connections.”…

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