How can I connect a Windows 10 laptop to a Cisco ASA via VPN using L2TP/IPSec rather than AnyConnect? Apparently, the Cisco client is no longer supported, and the Windows 10 built-in client gives me the following error:
The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.
Because of the scale of our deployment, switching to AnyConnect is not an option.
debug crypto isakmp 100
anddebug crypto ipsec 100
show? Have you tried this on just 1 client so far or do they all fail?