When we started this month of patching, I fully expected to come back by now with massive listings of applications that hated the February updates. That hasn’t been the case, though there have been some issues related to .NET this month. 

In case you’re wondering, .NET is a framework used by developers to build applications. It makes for standard coding techniques and “managed code” and can make an app more secure. Developers primarily use Visual studio to develop software that we all use on our Windows systems.

Known issues affecting Visual Studio most dramatically appeared in updates first introduced with the cumulative .NET updates beginning last month. KB4598301 was released Jan. 26 as an optional preview update for .NET on Windows 10 1909 and caused Visual Studio to crash. Then KB4601056, released Feb. 9, suffered from the same issue. So Microsoft released a preview update a week later —  KB4601556 — that fixed the underlying issue in Win10 1909.

The Patch Tuesday release of KB4601887 for Windows 10 1809 was later fixed by KB4602298, though not for all platforms. For example, the release of KB4601050 for Windows 2004/20H2, KB4601054 for Win10 1803, and  KB4601051 for Win10 1607 were not fixed with later releases. I expect that for these platforms you’ll have to wait until the March updates arrive if you are seeing application crashes.

Otherwise, I’ve been surprised by how few reports of issues I’ve seen after these updates were installed. In my own personal testing, I have not seen issues — though there have been reports of problems from other users. One report involves Autodesk’s Inventor 2020 and 2021, which crashes with these updates installed. But application crashes have been few and far between; thus, I don’t anticipate you will have issues this month.

Another report I’ve seen comes from the VMware forum, where this patch was installed on Server 2016 deployments and blocked the ability to fully enroll iOS devices with Intelligent Hub 21.01. As the VMware knowledge base notes, several .NET updates released in February cause issues with Workspace ONE UEM functionality including secure channel communication.

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