have a client that is getting disconnected quite frequently from our VPN Concentrator and  in looking at the server I cna find no issues or cause for the disconnect. his ping to the concentrator never fails, but yet is disconnects. I have hundreds of remote VPN clients connecting to the same concentrator without issues.

client is running

     Cisco Systems VPN Client Version 5.0.07.0290

     Copyright (C) 1998-2010 Cisco Systems, Inc. All Rights Reserved.

     Client Type(s): Windows, WinNT

     Running on: 6.1.7600 Cisco Systems VPN Client Version 5.0.07.0290
     Copyright (C) 1998-2010 Cisco Systems, Inc. All Rights Reserved.
     Client Type(s): Windows, WinNT
     Running on: 6.1.7600

the client sent me a VPN client log file an dI see the following that concern me. looking for an explanation of what these mean. in the below you will see the keepalives showing the connection is established and working then there is a burst of  logs (659-678) that I can't understand and would like too know what's going on

657    10:22:32.992  06/16/11  Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

658    10:24:34.788  06/16/11  Sev=Info/6 IKE/0x63000055
Sent a keepalive on the IPSec SA

659    10:24:36.820  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

660    10:24:37.330  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

661    10:24:37.840  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

662    10:24:37.840  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

663    10:24:37.840  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

664    10:24:37.840  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

665    10:24:37.840  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

666    10:24:38.344  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

667    10:24:38.344  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

668    10:24:38.344  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

669    10:24:38.858  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

670    10:24:38.858  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

671    10:24:38.858  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

672    10:24:38.858  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

673    10:24:38.858  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

674    10:24:38.858  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

675    10:24:39.358  06/16/11  Sev=Info/5 IPSEC/0x63700001
DNE Status code: 0xa1230010, CNI Error code: 0xa4510009 from (DneCniApi:327)

676    10:24:39.866  06/16/11  Sev=Info/4 IKE/0x63000013
SENDING >>> ISAKMP OAK INFO *(HASH, NOTIFY:DPD_REQUEST) to a.b.c.d (Ip removed for security)

677    10:24:39.866  06/16/11  Sev=Info/6 IKE/0x6300003D
Sending DPD request to a.b.c.d (Ip removed for security), our seq# = 1084087197

678    10:24:39.868  06/16/11  Sev=Warning/3 CM/0xA3100027
Adapter address 192.168.1.104 has changed or not detected.  Current address(es): 192.168.12.11.

679    10:24:39.868  06/16/11  Sev=Info/4 IKE/0x63000001
IKE received signal to terminate VPN connection