Unable to login to PPTP server

[Jason Tost]

Hi all,

I have a Win2k server that I am trying to use as a PPTP VPN server. When a
client tries to log in via PPTP they get an error like this:

The authentication server did not respond in a timely fashion.

The event log on the VPN server also logs this event. A couple questions.
First of all, this machine is sitting behind a firewall, with PPTP access
opened up and traffic forwarded to the VPN server. Is this going to be a
problem? Does the VPN machine have to have two network interfaces, one to
connect to the public network and one for the private network for PPTP to
work on Win2k?

Thanks in advance!
Jason

 

[Marc Reynolds [MSFT]]

Hi Jason,

The firewall needs to have TCP port 1723 and IP Protocol 47 (GRE) open for
a remote connection to be made.

Thanks,
Marc Reynolds
Microsoft Technical Support

This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------

 

[Marc Reynolds [MSFT]]

>

 

[Jason Tost]

So there aren't any issues with the PPTP server having only a single network
interface? As long as those ports are open through the firewall, I should
be able to connect and authenticate?

Thanks again for your assistance!

 

[Bill Grant]

Marc' reply got lost somewhere - I just got a < !

The client must connect to a registered public IP initially (ie an
interface that can be reached through the Internet). If you are using
private addresses on the LAN, that will mean your router.

So you need to forward PPTP (tcp port 1723) from the router to the VPN
server's IP address. The client connects using the router's public IP, but
the VPN connection is established through the LAN to the server's "virtual"
interface.