We are using Windows Server 2016 Remote Access. I believe the service on the clients that stopped working after the update was RASMAN. This solution is a L2TP VPN. When I troubleshoot I keep getting the error from the direct access troubleshooter that it can't tunnel to the direct access server but no errors are thrown when I run netsh in httpstunnel show int.
Hmm I see we are using Cisco Appliance for L2TP VPN and it works fine after applying (KB4522355) update...I hope you will get it to work