So our Client VPN has worked fine for a long time but now no one can connect. Nothing has changed so I don't understand what is going on.
Client side they get the The L2TP Connection Attempt Failed Because the Security Layer Encountered a Processing Error. I've checked and the IKE and AuthIP services is running.
I tried to do a packet capture but not sure what I'm looking for. I do see one for the Clients IP and I see the ISAKMP Phase 1 where it says Next payload: Security Association (1) but I don't see anything about a Key Exchange.