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Fixed VPN Error Code: 789, 835

RRAS, VPN, TS/RDP, Routing and remote Access.

Fixed VPN Error Code: 789, 835

Postby guest » Sun Aug 26, 2012 10:50 am

Error Code: 789, 835

Error Description:

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

Possible Solution: Make sure correct certificate is used both on client and server side – for further details refer to this blog. In case Pre Shared Key (PSK) is used, make sure the same PSK is configured on the client and the VPN server machine.
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