This error message can appear if there is an incorrectly defined group name or a password.
In order to resolve this issue, recreate the new group name and password for the VPN Client on the VPN 3000 Concentrator.
Refer to the What Can Go Wrong section of IPsec with VPN Client to VPN 3000 Concentrator Configuration Example for more information about potential errors that can occur during client connection.
Connectivity to the device
Troubleshoot software feature
VPN - 3000 series concentrator
VPN - hardware & software clients
Cisco VPN Client
VPN 3000 series
IPSec session is not established
received an unencrypted packet when crypto active!! Dropping packet