I am trying to reach a WIndows XP machine by using the IPSEC in FC3. I believe almost all configurations were done through the use of the IPSEC tab in the system-config-network command. Looks like the IKE protocol is working, but they cannot communicate.I see the messages 'Negotiating IPSEC failed' , when I ping the FC3 machine from XP. When I ping the XP from FC3, I get the message 'resource unavailble temporarily'. Through the tcpdump, I notice that 6 ISAKMP messages are transmitted from the FC3 to the XP. The information above might be not enough to give you a figure. However, I would feel great to share any idea on this point. Best Regards, Kyesang Lee