The error means that something is still using the UDP Port 500 that the Cisco VPN Client is using.
Applications that we've run into that use it are "Racoon" and the Mac's built in L2TP over IPSec client. They have two options:1) Find the other appl...
Can you send the debugs while you try to connect via L2TP...#debug l2tp 255#deb crypto isakmp 200#deb crypto ipsec 200Make sure you connect via mschap enabled usernameuser cisco pass cisco priv 0 mschapv2Pradhuman Singh
First try this:On a Windows 7 PC go to C:\Program Files\Cisco Systems\VPN Client\ProfilesOpen .pcf with Notepadadd these commands at the end:ForceNatT=1UseIKELegacyPort=1Test the VPN client!If it still has issues,try reinstalling the VPN client after...