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The Window XP SP2 firewall feature can cause the Cisco VPN client to quit working. Those using the IPSec/UDP as their "Transport" setting will not see a problem. Those using either IPSec or IPSEC/TCP, will get the message "Reason 412: The remote peer is no longer responding.". If the IPSec/UDP setting does not work for you or you experience an abnormal number of disconnects, please refer to the following:

The included firewall in Windows XP Service Pack 2 may interfere with the Cisco VPN client software. If your VPN connection is not functional with XP SP2, you may correct the problem by installing the latest VPN client software and verifying that you are using IPSec over UDP as your transport. If you are still unable to connect using Windows XP SP2 and the latest VPN client, add an exception in your firewall for UDP ports 62515 and 4500, and TCP port 10000.

1.  Open the Control Panel

2.  Open Windows Firewall

3.  Click the Exceptions tab

4.  Click Add Port

5.  Enter 'VPN' for Name and '10000' for Port Number, then click OK

6.  Click Add Port

7.  Enter 'VPN' for Name and '62515' for Port Number

8.  Select UDP, then click OK

9.  Repeat steps 6 - 8 using port '4500'