Microsoft confirms KB4541335 causes VPN to fail in Windows 10

Some enterprise Windows 10 users may have discovered when using a virtual private network that sometimes the proxy server connection may be faulty. Specifically, the network connection status indicator in the notification area will show that the connection is limited or no network. This situation may occur very frequently.

Microsoft stated in the Windows 10 status description that

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 to or disconnected from a VPN or after changing the 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 include, but are not limited to, Microsoft Teams, Microsoft Office, Microsoft Office 365, Microsoft Outlook, Internet Explorer 11, and some versions of Microsoft Edge.

Microsoft said the company has begun developing and testing a fix for the issue and expects to release an update early next month to completely resolve the issue.

If the current user encounters this problem, the only solution is to restart the system. After restarting, trying to connect to the virtual private network again should restore network use.

In addition, this update does not only affect the Windows 10 Version 1909 series. In fact, this fault exists in versions v1709 and higher.