On Wed, 26 Jan 2005 10:45:31 +0100, Stefano Razzauti
<stefano dot razzauti at yogitech dot com> wrote:
> Hi all,
> I need to open a PPTP-VPN connection with a m0n0wall inside a network
> with a front-end firewall.
> I need to know what are the firewall ports to be opened to enable the
> access by PPTP.
> I've tried to open the 1723 tcp and udp port but the VPN connection is
> not estabilished: I obtained the
> following error in the m0n0wall system logs:
> 
> mpd: [pt1] error writing len 42 frame to bypass: Can't assign requested
> address
> 

m0n0wall automatically opens the appropriate ports when you enable
PPTP, so you don't have to open anything.

That message has been discussed in the past, the following might help.  

http://m0n0.ch/wall/list/?action=show_msg&actionargs[]=68&actionargs[]=04
http://m0n0.ch/wall/list/?action=show_msg&actionargs[]=50&actionargs[]=12
http://www.google.com/search?hl=en&lr=&c2coff=1&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&q=%22Can%27t+assign+requested%22+site%3Am0n0.ch&btnG=Search

-Chris