MessageHi Thomas It just so happens that I upgraded a machine in the middle of setting up this precise scenario and experienced precisely this problem, although rather strangely not right from the outset. I spent hours before myself and guy at Cisco worked out what was going on. At the time it did not make sense but now in light of this it makes perfect sense. It worked though our firewall (a Cisco PIX 515E) one day then suddenly not the next. The strange thing is that I was only upgrading the version of SP2 to a later build of it and not from SP1. So this must have worked on previous builds of SP2 I guess? Hence why it didn't readily make the connection. Regards, Paul Lemonidis. ----- Original Message ----- From: Thomas W Shinder To: [ISAserver.org Discussion List] Sent: Tuesday, August 24, 2004 6:42 PM Subject: [isalist] FYI: Microsoft addresses NAT conflict introduced by SP2 - News - ZDNet http://www.ISAserver.org XP SP2 breaks VPN L2TP/IPSec NAT-T: Microsoft addresses NAT conflict introduced by SP2 - News - ZDNet: http://zdnet.com.com/2100-1105-5321783.html ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 Exchange Server Resource Site: http://www.msexchange.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: paul_lemonidis@xxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx