VPNӵʱ789L2TP ӳʧ,ΪȫԶ̼гʼЭʱ 
öȷģԭWINXPҪע޸¡

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\RasMan\Parameters
½һDwordProhibitIPSecֵΪ1
ProhibitIPSec=  dword:00000001  

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