That is because for some reason Cisco uses a propriatary authentication 
system on the PIX that only works with other PIX boxes.  If you are 
stuck with cisco hardware, which isn't a bad thing, you need to use a 
Cisco 3000 VPN concentrator.

Jean-Francois Theroux wrote:

> Falcor wrote:
>
>> Hi all, please do not ignore this post.  I know I could search the 
>> archives but I am in the middle of writing the how-to IPSEC with 
>> m0n0wall document and just wanted to include all clients that work 
>> with IPSEC.  E.g. what client software have you found that will allow 
>> you to use the roaming IPSEC connections back to your m0n0wall.  If 
>> you don't mind, please include the URL where it can be downloaded 
>> form, and include weather or not it is free.
>>
>> I hope to have this done in the next few hours and it should be as 
>> good as the PPTP document, on that same note I have an update to the 
>> PPTP document that I need to get out.
>>
>> -F
>>
>>
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>>
> A m0n0wall to Cisco PIX how-to would be nice. I tried for a while, but 
> it was never able to negotiate the pre-shared key. Although the 
> settings the m0n0 box and the PIX were the same.
>
> -jf