Microsoft releases Windows 10 build 14393.2641 - here's what's new

Patch Tuesday is next week, but Microsoft has released a new cumulative update for those that are on the Windows 10 Anniversary Update, or version 1607. Specifically, it's for users on the Long-Term Servicing Channel (LTSC), and those on the Windows 10 Enterprise and Education SKUs. Users on the Windows Server 2016 LTSC SKU will also get it. Windows 10 Home and Pro version 1607 are not supported anymore, and those users should upgrade to a newer version of the OS.

The update that's rolling out is KB4478877, and it brings the build number to 14393.2641. You can manually download it here, and it only contains a single fix:

  • Addresses an issue that prevents the release of the on-demand Source Network Address Translation (SNAT) port allocated to a virtual machine (VM) after the SNAT port is no longer in use. As a result, the SNAT port becomes exhausted.

Unfortunately, there are also three known issues to be aware of:

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.

After installing this update, users may not be able to use the Seek Bar in Windows Media Player when playing specific files. This issue does not affect normal playback.

Microsoft is working on a resolution and estimates a solution will be available mid-December 2018.
When features related to end-user-defined characters (EUDC) are used, the entire system may become unresponsive.

Double-click any font file or navigate to the font folders immediately after logging on.

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


All of these known issues are the same as the update that was released last week. As usual, you don't actually have to manually install these updates, as they'll arrive automatically through Windows Update.

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