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

You may encounter the following error message when using the L2TP/IPSec VPN Client that is native to the Windows Operating System: "The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer."  This error message typically occurs when you are using the wrong Pre-Shared Key for your L2TP VPN.  This error message can occur when other components of your configuration are incorrect but the first thing to confirm is that you are using the correct Pre-Shared Key.

If you are using the wrong Pre-Shared Key, the L2TP VPN connection will say Connecting for a long period of time and then display the error message: "The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer."

If you are using the wrong username or password, the L2TP VPN will immediately respond with: "The remote connection was denied because the user name and password combination you provided is not recognized, or the selected authentication protocol is not permitted on the remote access server."

If you are using the correct username, password and pre-shared key, the VPN connects immediately.
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