PPTP (VPN) over a firewall

[Ma Yao]

I am trying Install PPTP server on a server that is behind a firewall and be able to coonect to it.


Server A is internal on the network.
Server B is outside the network.

There is a firewall between both. The security is very tight on the firewall. Everything is allowed to go out, but nothing to come in. All port are closed now. I want to install PPTP on server B and get to it from A.

The question? What ports do I need to open and which direction to be able to connect to server B from A.

Right now I can't ping server B from A, but I can access the Web Server on B from A.

Thanks in advance.

[Scott Wilson]

Hi,

PPTP can be used with most firewalls and routers by enabling traffic destined for port 1723 to be routed through the firewall or router.

Have a look at the Microsoft white paper at:

http://www.microsoft.com/ntserver/commserv/techdetails/prodarch/understanding_pptp.asp

Good luck
Scott
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Ma Yao at 3/10/99 11:13:29 AM



I am trying Install PPTP server on a server that is behind a firewall and be able to coonect to it.


Server A is internal on the network.
Server B is outside the network.

There is a firewall between both. The security is very tight on the firewall. Everything is allowed to go out, but nothing to come in. All port are closed now. I want to install PPTP on server B and get to it from A.

The question? What ports do I need to open and which direction to be able to connect to server B from A.

Right now I can't ping server B from A, but I can access the Web Server on B from A.

Thanks in advance.

[Craig Manske]

you need to make sure TCP port 1723 (for PPTP) or UDP port 500 (for IPsec) is open for the VPN to communicate through the firewall. You also need to open up IP port 47 (for PPTP) or IP port 50 (for IPsec). The IP port is not TCP/UDP or ICMP it's IP.

-cm

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Ma Yao at 3/10/99 11:13:29 AM



I am trying Install PPTP server on a server that is behind a firewall and be able to coonect to it.


Server A is internal on the network.
Server B is outside the network.

There is a firewall between both. The security is very tight on the firewall. Everything is allowed to go out, but nothing to come in. All port are closed now. I want to install PPTP on server B and get to it from A.

The question? What ports do I need to open and which direction to be able to connect to server B from A.

Right now I can't ping server B from A, but I can access the Web Server on B from A.

Thanks in advance.