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Error code: 835

Feb 23, 2015
Jun 25, 2019
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This occurs when the L2TP connection fails due to a security layer that’s unable to authenticate the remote computer.

Possible Cause: Error code 835 normally occurs when the certificate submitted to the remote server is unable to validate the target destination. In technical terms, it happens when the IPSec negotiation fails for L2TP/IPSec connections.

Likely causes for this error are:

  • L2TP based VPN client (or VPN server) is behind NAT.
  • An incorrect certificate or pre-shared key is set on the VPN server or client.
  • Machine certificate or trusted root machine certificate is not present on the VPN server.
  • Machine Certificate on VPN Server does not have ‘Server Authentication’ as the EKU

Possible Solution: You must ensure that the correct certificate is used on both the server and client side. In case Pre-Shared Key (PSK) is used, make sure to use Pre-Shared Key 12345678.

If the above information helped resolve the error code 835, kindly use the comment box below for your suggestions and feedback. For any additional help, please submit a support ticket with errors and screenshots (if possible) or contact our 24/7 live chat support team.

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