Microsoft says it’s investigating reports of VPN connection failures after installing the April 2024 Windows 11 update. The KB5036893 security update was issued on April 9th for all supported Windows 11 versions, and some users have reported that VPN connections with TPM-backed certificates aren’t working after the patch was installed.

Reddit user Flo-TPG says the Windows 11 update caused “a certificate could not be found” error while attempting to use a VPN connection. Microsoft warns that VPN connections could fail after installing this April 2024 security update and that the company is “investigating user reports, and we will provide more information in the coming days.”

The only workaround right now is to uninstall the KB5036893 update, and Microsoft says it’s planning to work on a resolution “in an upcoming release,” which suggests a hotfix is on the way.

These latest VPN issues come nearly a year after Microsoft had to fix major speed issues affecting L2TP / IPsec VPN connections in Windows 11 after an update caused problems. Microsoft has a Windows Insider program that’s designed to catch bugs in early versions of Windows updates, but security patches can often cause unexpected issues like these VPN incidents.