Hi Nick, We didn't go into the intricacies of VPN, because that's for a future book :-) L2TP/IPSec tunnels are another ballgame completely. PPTP is plug and play. L2TP/IPSec requires some planning. However, check out Q240262 if you don't want to break your brain on Certificate Server :-) HTH, Tom www.isaserver.org/shinder Thomas W Shinder, M.D., MCSE, MCT -----Original Message----- From: Nicholas Palmer [mailto:NICK@xxxxxxxxxxx] Sent: Tuesday, August 28, 2001 11:10 AM To: [ISAserver.org Discussion List] Subject: [isalist] IPSEC/L2TP VPN on ISA Server http://www.ISAserver.org Hi all, I've got a question about setting up a Server to Server VPN. I followed the example in the back of Tom's book to set up a VPN between to different Servers(both with ISA), and everything seems to work OK. Well it works OK when I use PPTP as the Authentication protocol. If I try to use IPSEC it fails to Authenticate. I've read somewhere in Tom's book about an IPSEC driver that needs to be installed, but I've also seen that you can't do IPSEC if you are doing NAT, which ISA does right? So what is the answer here. Thanks in advance, Nick. ____________________ Nicholas Palmer KCI Computing, Inc. (nick@xxxxxxxxxxx) ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: tshinder@xxxxxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')