The L2TP connection attempt failed because the security layer encountered a processing error during the initial negotiations with the remote computer. Please contact your Administrator or your service provider to determine which device may be causing the problem. firewalls, NAT, routers, etc) between your computer and the remote server is not configured to allow VPN connections. This could be because one of the network devices (e.g. The network connection between your computer and the VPN server could not be established because the remote server is not responding.This tutorial contains instructions to solve the following errors, while trying to connect to L2TP/IPsec VPN server in Windows 10 or Windows Server 2012/2016: So the first step to troubleshoot VPN connection problems, is to verify that all the VPN settings are correct. incorrect server name/address, authentication method, username or password). VPN connection errors can be caused by a variety of causes, but are usually due to incorrect settings of the VPN connection (e.g. If you cannot connect to your L2TP/IPsec VPN server from Windows 10, continue reading below to solve the problem.
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