We have been encountering this recurring issue on our Sonic Wall NSA 250 M L2TP VPN connection. User that are trying to connect to the L2TP VPN gets this error "The L2TP connection attempt failed because the security layer could not negotiate compatible parameters with the remote computer." After soft restarting the device, users are able to connect to the VPN again. The current firmaware version is SonicOS Enhanced 5.9.1.1-39o. The issue happens every couple of months or so. We are thinking of updating the firmware might resolve the issue but we are hesitant to do it because it might affect our site to site VPN connection that uses Sonic Wall box as well.
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