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L2TP connection attempt failed because the security layer

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L2TP connection attempt failed because the security layer

Postby chicagotech » Sat Sep 02, 2017 4:12 pm

789: The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.

835: The L2TP connection attempt failed because the security layer could not authenticate the remote computer. This could be because one or more fields of the certificate presented by the remote server could not be validated as belonging to the target destination.


Possible Causes: This is a generic error which is thrown when the IPSec negotiation fails for L2TP/IPSec connections.

Possible causes for this issue could be:

a> L2TP based VPN client (or VPN server) is behind NAT.

b> Wrong certificate or pre-shared key is set on the VPN server or client

c> Machine certificate or trusted root machine certificate is not present on the VPN server.

d> Machine Certificate on VPN Server does not have 'Server Authentication' as the EKU
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Re: L2TP connection attempt failed because the security layer

Postby chicagotech » Sat Sep 02, 2017 4:13 pm

1.Open Administrative Tools through the Control Panel.

2. Double-click Services.

3. Look for IPSEC Services. (ike and AuthIP IPsec Keying Modules,IPsec policy agent) Confirm that the Startup Type is Automatic and Status is set to Started. If needed, double-click IPsec Services to change these settings.
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Re: L2TP connection attempt failed because the security layer

Postby chicagotech » Sat Sep 02, 2017 4:15 pm

In my case, it is ike and AuthIP IPsec Keying Modules disabled. Enabling it works.
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