There is a limit on Pptp sessions.
I found this link in the ML archive :  
http://www.michael-i.com/files/projects/m0n0ad/index.php.
He made a modified version of monowall to change the limit to 64

Raphaël

R. Benjamin Shapiro wrote:

> Hi Folks,
>
> I looked through the archives and didn't see a definitive answer. What 
> is the maximum number of PPTP clients that can simultaneously connect 
> to a mono? I saw somewhere that there was a max of 16. Has this cap 
> been lifted? If so, am I only limited by memory/CPU? If so, I should 
> be good for plenty on my P3, right?
>
> Thanks,
> Ben
>
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