error 792 when trying to use a preshared key on my xpclient machine

I have a ---  error 792 -l2tp negotion failed because a securtiy negotion timed out --when trying to use a preshared key on my xp client machine
I used routing and remote access  ipsec and added a preshared key on the server
I went to the client and used vpn l2tp - ipsec with the same shared key

Can i just put the preshared key in both machines and connect ??  or do i have to install a certificare.
I want to connect a xp client with a preshared key to  a sbs 2003 server!!

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Brian PiercePhotographerCommented:
You shouls be able to use a preshared key - see

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independencetechAuthor Commented:
thanks i have the client set --still not connecting --  do i need to have input and output filters working for  the server for connection to work --

thanks getting close
independencetechAuthor Commented:
PPTP or L2TP/IPSec filtering
To secure the VPN server from sending or receiving any traffic on its Internet interface except VPN traffic, you need to ensure that PPTP or L2TP/IPSec input and output filters are configured on the interface that corresponds to the connection to the Internet. For more information about PPTP filters, see Add PPTP Filters. For more information about L2TP/IPSec filters, see Add L2TP over IPSec Filters

do you think this is the problem -- if so what nic card do i use for the address ----the wan i am assuming
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independencetechAuthor Commented:
did nothing but a genetic l;ink -- once again experts-exchange seems like nothing more than a google search with no follow up on anything but simple questions.  Posting as urgent seems to mean niothing --  
independencetechAuthor Commented:
i will be looking around for a replacemnt to experts-exchange -- i would ask a question but  -- whats the point
independencetechAuthor Commented:
please retract previous -- i need to use the system better by not asking more than one question at a time thanks answer was fine nothing against you
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