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When you say 'you have installed vpn server on ISA', what exactly do you mean?
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When you say 'you have installed vpn server on ISA', what exactly do you mean?

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Means I enabled VPN client access on ISA Server
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Means I enabled VPN client access on ISA Server

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Hi,<br />
I have a router(Netcomm NB9W) which is connected to the internet<br />
After the router in my internal network, <br />
I have ISA Server 2006, which is in between my public computers and private computers<br />
Now I have installed VPN server on ISA server, to access my private network from internet <br />
and I did port 1723(pptp) forwarding on the router to my ISA server<br />
and when I try to connect to my public ip address(routers external)<br />
I get a error 800: Unable to establish the VPN Connection<br />
<br />
Even I tried to connect directly from my public computers to the VPN server <br />
I got the same error 800<br />
<br />
I am even not able to telnet to ISA server on port 1723<br />
<br />
Can anyone help me out <br />
thank you 
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Hi,
I have a router(Netcomm NB9W) which is connected to the internet
After the router in my internal network, 
I have ISA Server 2006, which is in between my public computers and private computers
Now I have installed VPN server on ISA server, to access my private network from internet 
and I did port 1723(pptp) forwarding on the router to my ISA server
and when I try to connect to my public ip address(routers external)
I get a error 800: Unable to establish the VPN Connection

Even I tried to connect directly from my public computers to the VPN server 
I got the same error 800

I am even not able to telnet to ISA server on port 1723

Can anyone help me out 
thank you 

VPN on ISA Server 2006

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.

Microsoft Forefront ISA Server

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.