[German]There is a bug in all still supported versions of Windows 10 and Windows Server 2016/2019 – caused by recent updates. This can prevent applications from connecting to the Internet. A bugfix is not expected before April 2020.
In the Windows 10 release information you can find the information on March 26, 2020 that there is an issue with Internet connections via a proxy.
Devices using a proxy might show limited or no internet connection status
Devices using a manual or auto-configured proxy, especially with a virtual private network (VPN), might show limited or no internet connection status in the Network Connectivity Status Indicator (NCSI) in the notification area.
This might happen when connected or disconnected to a VPN or after changing state between the two. Devices with this issue, might also have issues reaching the internet using applications that use WinHTTP or WinInet.
Examples of apps that might be affected on devices in this state are as follows but not limited to Microsoft Teams, Microsoft Office, Office365, Outlook, Internet Explorer 11, and some version of Microsoft Edge.
If an application uses a proxy connection, there may be problems with the Internet connection. This especially affects Virtual Private Network (VPN) software and its connections. The network icon in the notification area of the taskbar may show limited or no Internet connection status in the Network Connectivity Status Indicator (NCSI).
This can happen when a connection to a VPN is made or disconnected, or after the status between the two has changed. On affected devices, applications may also have difficulty reaching the Internet via WinHTTP or WinInet.
Examples of applications that could be affected on equipment in this state include Microsoft Teams, Microsoft Office, Office365, Outlook, Internet Explorer 11 and some versions of Microsoft Edge. The list of applications that cause problems is not limited to the above list of applications.
You may be able to temporarily resolve the problem by restarting the device. The following versions of Windows are affected.
- Windows 10, version 1909; Windows 10, version 1903; Windows 10, version 1809; Windows 10 Enterprise LTSC 2019; Windows 10, version 1803; Windows 10, version 1709
- Windows Server, version 1909; Windows Server, version 1903; Windows Server, version 1809; Windows Server 2019; Windows Server, version 1803; Windows Server, version 1709
As the cause of this bug, Microsoft states the cumulative update KB4535996 for Windows 10 version 190x and its server counterparts from February 27, 2020. KB4535996 is causing other issues (see links at the end of this article).
For older Windows 10 versions, other updates must be responsible. In the Japanese Technet, this article lists a number of updates for various versions of Windows 10 (see also the comment below). Microsoft is working on a solution and aims to publish a special update (out-of-band update) in the Microsoft catalogue by the beginning of April. (via)
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