[German]Microsoft has also fixed a performance issue on Windows Server 2019 with the September 2024 update KB5043050. When the August 2024 patchda update was installed, there were performance problems caused by cumulative update KB5041578 for Windows 10 Enterprise 2019 LTSC and Windows Server 2019. The bug was confirmed and the fix causing it was rolled back via KIR. Microsoft has completely eliminated the cause of the bug with the August 2024 security update.
Performance isseus with update KB5041578
On August 13, 2024, the cumulative update KB5041578 for Windows 10 2019 Enterprise LTSC and Windows 10 2019 IoT Enterprise LTSC as well as Windows Server 2019 was released (Patchday: Windows 10/Server Updates (August 13, 2024)). The update contains a number of bug fixes, which are listed in the support article. Among other things, the Windows TCP/IP Remote Code Execution vulnerability CVE-2024-38063, which is classified as critical (CVEv3 Score 9.8), has been closed. However, there was a huge problem with this update.
I reported in the blog post Windows Server 2019/Windows 10 Enterprise 2019 LTSC: Performance Issues with Update KB5041578 that there are serious problems with Windows Server 2019 (and even with Windows 10 2019 Enterprise LTSC systems) on some systems after the update installation.
- The devices are extremely slow and barely usable, as I described in one case with Windows 10 clients.
- With Windows Server 2019, the Remote Desktop no longer works or responds very slowly. A black screen may also appear.
It is then no longer possible to work on affected systems. In addition to uninstalling the update in question, I pointed out in my blog post that a workaround is to delete the contents of the folder:
C:\Windows\System32\catroot2
This fixes a problem with the encryption services that is responsible for this behavior. On August 21, 2024, Microsoft published the support article Servers might face performance issues with the August 2024 security update in the Windows Release Health status area for Windows Server 2019. There, Microsoft confirms that after installing the Windows security update KB5041578 from August 13, 2024, problems may occur with Windows Server 2019 installations.
This includes "system slowdowns, unresponsiveness and high CPU utilization", especially with cryptographic services. The fix causing the issue has been fixed via Known Issue Rollback (KIR). I had reported in the blog post Windows Server 2019: Microsoft confirms and fixes performance issues with update KB5041578.
Update KB5043050 fixes problems
It has already been noted by blog readers in various comments. With the September 2024 update KB5043050, Microsoft has now eliminated the cause that led to the above problems.On September 9, 2024, Microsoft updated the support article Servers might face performance issues with the August 2024 security update in the Windows Release Health status area for Windows Server 2019.
There, Microsoft writes that the bug caused by the installation of the Windows security update KB5041578 from August 13, 2024, has been fixed by the security update KB5043050 from September 10, 2024 in Windows Server 2019. It is recommended to install the latest security update for the system.
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