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:
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.
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