A couple months ago we had this exact same problem, and this week it cropped up again.
Users report that they will be able to connect to the VPN successfully, but later in the day they will try to connect and receive the message:
Secure VPN connection terminated by peer
Reason 433: (Reason not specified by Peer)
I assume this is sporadic because it might only be happening when multiple users are connecting to the VPN at the same time.
I have seen other forums discuss using a command to resolve the issue:
for NAT traversal, however this command is not recognized when I try to enter it into the config.
Please, any help would be greatly appreciated.
I think it may also be important to mention that the issue seems to go away after power cycling the router, at least for a few weeks. I'm not sure if this is a coincidence.
Thank you in advance.