Microsoft released a new cumulative update for those still running the Windows 10 1607 a.k.a. Windows 10 Anniversary update. However, the catch here is that the update to only hit to those who are on the Long-term Servicing Channel(LTSC) or have Windows 10 Enterprise or Education SKUs.
Aside from bringing the Build number to 14393.2641, the new cumulative update KB4478877 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.
However, things are not all rosy. The cumulative update has its downside as listed below.
|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.|
Head over to the Settings app and click on the Update & Security then click on check for update. You can also manually download the update from here.