I have experienced this same problem... however my connection only seems 
to stay up a few minutes. I can't see anything in the log that would 
explain it.
I have tried connecting from 2 computers and get the same thing.

Salcido, Cesar wrote:
> For some reason which I cannot figure out, I cannot keep a stable
> connection to my m0n0wall. I loose connection after what seems like 30
> minutes, and when I try to reconnect I get a error 732, could not agree
> on PPP control protocols. I have followed the guides and appear to have
> all my settings correct.  The only way I can successfully reconnect is
> by rebooting my m0n0wall, but after a few minutes the process starts all
> over again. Any ideas?????
>
>  
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>  
>
> Respectfully
>
> Cesar R Salcido 
>
> www.guidancesoftware.com
>
>  The World Leader in Computer Investigations
>
>  
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>