Some Version 1607 Machines Fail to Startup After Installing Microsoft’s Latest Security Patch

Rafia Shaikh
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To update or not to update...

Surprising no one, Microsoft's latest out-of-band security patch that was delivered last week to address an Internet Explorer bug is causing issues for a few Windows devices. The company has updated the list of known issues that have been brought in by the latest security patch. Except for Windows 10 October 2018 Update, every version appears to be vulnerable to at least some of these known issues.

Microsoft has shared the following list of known issues. Adding to this list is also an issue that the November security update brought in affecting some Lenovo machines running the Windows 10 Anniversary Update (version 1607). Microsoft says it is working with Lenovo to bring a fix to this problem where Windows fails to startup on some of the Lenovo laptops that have less than 8 GB of RAM.

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Here's the complete list and possible workarounds to fix these issues until Microsoft rolls out their fixes with an upcoming release.

Symptom Workaround
After you install the August Preview of Quality Rollup or September 11, 2018 .NET Framework update, instantiation of SqlConnection can throw an exception. For more information about this issue, see the following article in the Microsoft Knowledge Base:

4470809 SqlConnection instantiation exception on .NET 4.6 and later after August-September 2018 .NET Framework updates.

Microsoft is working on a resolution and will provide an update in an upcoming release.
System Center Virtual Machine Manager (SCVMM) managed workloads are noticing infrastructure management issues after VMM refresh as the Windows Management Instrumentation (WMI) class around network port is being unregistered on Hyper-V hosts. Run mofcomp for the scvmmswitchportsettings.mof, VMMDHCPSvr.mof, and other relevant SCVMM MOF Files. Please upgrade thru the SCVMM 2016 Update Rollup 6 (UR6) to expedite the Host Refresh activities after running mofcomp command.
After installing this update on Windows Server 2016, instant search in Microsoft Outlook clients fail with the error, "Outlook cannot perform the search". To alleviate the symptoms, run sfc /scannow as described in step 3 of Use the System File Checker tool to repair missing or corrupted system files. Then restart Microsoft Outlook.

Microsoft is working on a resolution and will provide an update in an upcoming release.

After installing KB4467684, the cluster service may fail to start with the error “2245 (NERR_PasswordTooShort)” if the Group Policy “Minimum Password Length” is configured with greater than 14 characters. Set the domain default "Minimum Password Length" policy to less than or equal to 14 characters.

Microsoft is working on a resolution and will provide an update in an upcoming release.

After installing KB4467691, Windows may fail to startup on certain Lenovo laptops that have less than 8 GB of RAM. Restart the affected machine using the Unified Extensible Firmware Interface (UEFI). Disable Secure Boot and then restart.

If BitLocker is enabled on your machine, you may have to go through BitLocker recovery after Secure Boot has been disabled.

Microsoft is working with Lenovo and will provide an update in an upcoming release.

We will update this space as these problems get fixed. For a list of Windows 10 October 2018 Update known issues acknowledged by Microsoft, check this piece.

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