Windows 7/8.1 Preview Rollup Updates (04/17/2018)

Windows Update[German]Microsoft has released updates for Windows 7 (KB4093113), Windows 8.1 (KB4093121) and the relevant server counterparts as of April 17, 2018. These are the monthly preview rollup updates.


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Preview Rollup Updates means a preview of updates that appear on patchday of the following month. These optional updates do not actually need to be installed (unless you are affected by a fixed bug).

Similar to the security updates of April 14, 2018, the update installation no longer depends on the cadca5fe-87d3-4b96-b7fb-a231484277cc registry entry in branch:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\QualityCompat\

(which signals antivirus compatibility). The updates are offered independently from this registry key via Windows Update and WSUS.

KB4093113 for Windows 7/Windows Server 2008 R2

Update KB4093113 is available for Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1 as Preview of Monthly Rollup. It’s not a security update, and the package addresses the following issues:


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  • Addresses additional issues with updated time zone information.
  • Addresses a stop error that occurred when the previous month’s update was applied to 32-bit (x86) computers with Physical Address Extension (PAE) mode disabled.

The update is optional and can also be downloaded and installed via Microsoft Update Catalog . Since it is a preview update, I would not install it (unless you are affected by the PAE).

Known issues

This update still includes the SMB memory leak problem. This occurs when SMB shares contain symbolic links. Microsoft is working on a fix, but the error persists for some time through updates. A stop error also occurs on computers that do not support Streaming Single Instructions Multiple Data (SIMD) Extensions 2 (SSE2).

Update KB4099950 for Windows 7/Server 2008 R2

Update KB4099950 has also been released for Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1. This is the update that is intended to fix the problem of replacing network adapter (NIC) settings or losing static IP address settings after KB4088875 or KB4088878 is installed. Again, Microsoft points out that this update must be installed before installing the KB4088875 or KB4088878 updates..

Update KB4093121 for Windows 8.1/Server 2012 R2

Update KB4093121 is available for Windows 8.1 and Windows Server 2012 R2 as Preview of Monthly Rollup. This is not a security update that addresses the following issues:

  • Addresses additional issues with updated time zone information.
  • Addresses an issue that blocks failed NTLM authentications instead of only logging them when using an authentication policy with audit mode turned on. Netlogon.log may show the following:

SamLogon: Transitive Network logon of <domain>\<user> from <machine2> (via <machine1>) Entered

NlpVerifyAllowedToAuthenticate: AuthzAccessCheck failed for A2ATo 0x5. This can be due to the lack of claims and compound support in NTLM

SamLogon: Transitive Network logon of <domain>\<user> from <machine2> (via <machine1>) Returns 0xC0000413     

  • Addresses an issue that generates a certificate validation error 0x800B0109 (CERT_E_UNTRUSTEDROOT) from http.sys.
  • Addresses a race condition in iSCSI that might lead to queries that return incomplete sense data.
  • Addresses an issue that causes massive pool commit failures (ID 2019 and ID 2020) to occur when using dedupe and backup on large file servers.
  • Addresses an issue that causes a communication failure in an RPC-based network in certain situations. The error is “reason_not_specified_reject”.
  • Addresses an issue that might cause Windows Server 2012 R2 Domain Controllers (DC) to periodically restart after a Local Security Authority Subsystem Service (LSASS) module fault. This interrupts applications and services bound to the DC. DCs may log the following events:
    • Application Error event ID 1000; the faulty module is NTDSATQ.dll, and the exception code is “0xc0000005”.
    • User32 event ID 1074; Microsoft-Windows-Wininit event ID 1015 indicates that a critical system process, lsass.exe, failed with status code 255.
  • Addresses an issue that causes DTC to stop responding in msdtcprx!CIConnSink::SendReceive during an XA recovery. During this failure, IXaMapper objects with identical RMIDs are corrupted.
  • Addresses an issue that causes Eventcollector subscription to fail in cross-forest environments when the target’s FQDN label doesn’t match the domain’s NetBIOS name.
  • Addresses an issue that might cause clients that use CSVs to disconnect from SMB3 servers because srv2.sys doesn’t use SMB3 multichannel for recovery. When there are disconnections between nodes, this can cause unexpected failover of the CSVs and creates instability in the VMs located on those CSVs. The disconnections are detected as I/O timeouts and generate Event ID 5120 with “STATUS_IO_TIMEOUT”. Sometimes Event ID 5142 appears when recovery doesn’t occur.

The update is offered and installed independently of the Registry Checker for compatible antivirus solutions. The distribution takes place via Windows Update or in the Microsoft Update Catalog. There are no know issues.

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Microsoft Patchday Summary April 10, 2018
Patchday: Windows 10 Updates April 10, 2018
Patchday: Updates for Windows 7/8.1/Server April 2018
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Patchday: Other Microsoft Updates (April 10, 2018)
Windows 7/8.1 Preview Rollup Updates (04/17/2018)
Windows 10 Updates KB4093117 and KB4093120 (04/17/2018)


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