[pptp-server] Bypassing the firewall

[Sexy Boy]

Yes, it could be a solution, but the problem is that there is no way to
change the default settings on the Microsoft PPTP RAS client (change the
called port to 443). I've looked in the registry, if the install file
(*.INF) and even in some binaries (*.DLL) but without success.

But your solution is ok for other protocols like SSH (i've been using it for
several months).

Does someone know how to force NT 4.0 PPTP Ras client to connect on another
port than 1723 ?

Francois.

-----Message d'origine-----
De : pptp-server-admin at lists.schulte.org
[mailto:pptp-server-admin at lists.schulte.org]De la part de Jean-Serge
Gagnon
Envoyé : dimanche 19 août 2001 00:25
À : Sexy-Boy at netcourrier.com; pptp-server at lists.schulte.org
Objet : RE: [pptp-server] Bypassing the firewall


Why don't you just change pptpd to listen on port 443? It'll cause your
Linux to not be able to access https connections there, but you can always
have https listen on an other port...

- Talking Linux install: Newlix OfficeServer -
Jean-Serge Gagnon    <jsg at gaaj.qc.ca>
GaaJ Services        http://www.gaaj.qc.ca
(819) 568-7883       fax: (819) 243-4824

> -----Original Message-----
> From: pptp-server-admin at lists.schulte.org
> [mailto:pptp-server-admin at lists.schulte.org]On Behalf Of Sexy Boy
> Sent: Saturday, August 18, 2001 5:39 PM
> To: pptp-server at lists.schulte.org
> Subject: [pptp-server] Bypassing the firewall
>
>
> Hi,
>
> 	I have a litlle (big for me :-) problem and if some can
> help me it would be
> cool. So this is my problem :
>
> At home, i configure a PPTP server on my linux box and it is working fine.
>
> At my office, i would like to connect my NT 4.0 Workstation to my linux
> server but the problem is the firewall which allows only
> connection to port
> 21, 25, 80, 110, 443 but not 1723 ! (There is no way to change
> the firewall
> setting because it's managed by an external company and i can't
> ask them to
> change anything !)
>
> So what i'm trying to do is bypass the firewall with port redirection :
>
> On my NT 4.0       : i redirect local port 1723 to the remote
> port 443 on my
> linux box
> On my Linux server : i redirect local port  443 to local port 1723
>
> So if i want to connect to my Linux server on port 1723, i
> configure the RAS
> to connect to localhost:1723 which is redirect to remote:443 (this bypass
> the firewall) => redirect to linux:1723.
>
> The redirection is OK because i see the packet to my linux server (with
> tcpdump).
> The problem is that my Linux server considers that a local connection is
> attempted and refuse the connection !!!
>
> So my question is : Is there a way to allow local connection to a PPTP
> server (local connection = server and client on the same machine
> like FTP or
> HHTP) ?
>
> Thanks a lots,
> Francois.
>
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