EXPERT RESPONSE
According to this Microsoft
Knowledge Base entry,
there are registry entries for PPTP in SP2 that you may need to
set or update. Microsoft and others
have noted that Windows XP SP2 introduced problems for VPNs, such
as L2TP/IPsec, that require NAT traversal (NAT-T). While these
problems shouldn't affect PPTP, PPTP is very insecure and you
should consider upgrading to L2TP/IPsec if you have anything
greater than casual security requirements. If you do decide to
upgrade, see this
Knowledge Base article for information on fixing the NAT-T problem.
Visit our Learning Guide for Windows VPN troubleshooting tips.
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