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3. Internet Connection Firewall
In Windows XP and Windows XP SP1, the Internet Connection Firewall is not compatible with IPSec. Internet
Connection Firewall will drop packets from tunneling of IPSec VPN.
Suggestion: Please TURN OFF Internet Connection Firewall feature or upgrade the Windows OS into Windows XP
SP2.
4. ICMP and Active Mode FTP
On Windows XP SP2 that is without patch KB889527, ICMP packets will be dropped from IPSec tunnel. This
issue can be fixed by upgrading patch KB889527. Before enabling IPSec VPN function on client device, please
access the patch from Microsoft's web at: http://support.microsoft.com/default.aspx?scid=kb;en-us;889527.
This patch also fixes issues of supporting active mode FTP inside IPSec VPN tunnel of Windows XP SP2.
Suggestion: Please UPDATE client's Windows XP SP2 with patch KB889527.
Appendix H. IPSec VPN
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