The Cisco VPN 3000 Concentrator produces this error message when a user attempts to connect to the VPN 3000 Concentrator using an invalid group name or password:
No Group found matching <ID> for Pre-shared key peer <ISP IP address>
Check the group name configured on the Cisco VPN Client.
Note: The group name is case sensitive.
For more information, refer to the Troubleshoot section of IPSec with VPN Client to VPN 3000 Concentrator Configuration Example.