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Unable to connect the Cisco VPN client to VPN 3000 Concentrator and the "received an unencrypted packet when crypto active!! Dropping packet" error message appears in the event log of Concentrator

Core issue

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.

Problem Type

Connectivity to the device

Troubleshoot software feature

Product Family

VPN - 3000 series concentrator

VPN - hardware & software clients



VPN 3000 Software Version





VPN Client Software Version

Cisco VPN Client

VPN 3000 Model

Concentrator models

VPN Tunnel End Points


VPN 3000 series

VPN Protocols


VPN Tunnel Initialization

IPSec session is not established

VPN 3000 Event Logs

received an unencrypted packet when crypto active!! Dropping packet

Version history
Revision #:
1 of 1
Last update:
‎06-17-2009 10:08 PM
Updated by:
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