I have a VPN server running on Windows 2003 server.   
      
   I have 8 client computers (Windows XP & Vista). All clients and server are   
   in LAN.   
      
   7 clients can connect well with no problem. 1 client (WinXP SP3) hangs at   
   'Verifying username and password', and then give error 721.   
      
   I've tried using different vpn dialer, but to no avail.   
      
   I read somewhere from Microsoft website that I need to reset the permission   
   to NetworkAuthority account by running a line of command provided in their   
   web, and I have done that as well.   
      
   To date, that 1 client still unable to connect.   
      
   All VPN connections are using PPTP. I have created enough ports in the   
   server.   
      
   Any suggestion how to fix this problem?   
      
   Thanks.   
      
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