You are disabling custom IPsec policy for L2TP/IKEv2 connections. Verify that machine certificate, also known as computer ...

You are disabling custom IPsec policy for L2TP/IKEv2 connections. Verify that machine certificate, also known as computer certificate, is installed for L2TP/IKEv2 connections to succeed. 
Note: If the machine certificate is newly installed, you must restart Routing and Remote Access.