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NT4 Server not answering VPN connection

By todd ·
I am trying to establish a VPN connection using PPTP from an XP Pro laptop to an NT4.0 Server which is behind a D-Link DFL-300 Office Firewall.

I am using the firewall's "Virtual Server" feature to translate the real IP address on the Internet (which XP Pro uses as the destination IP address after the dial-up Internet connection is established) to the private IP address of the NT server on my network, for the PPTP port.

I get quite a ways with the VPN connection I set up on the laptop butit stops short of a connection with the NT server with error 678: "The connection could not be completed because the remote computer did not answer the
connection request." I have the proper permissions set in RAS but up until now have only accessed it by way of a direct dial-up (POTS) to an external modem connected to COM1.

If anyone has any ideas I would greatly appreciate their help in allowing me to give users access to the domain from anywhere they travel in the world. I know this is not an unusual thing to do but so far I can't seem to get any straight-forward answers. How's everyone else doing it?

Thank you

Todd

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NT4 Server not answering VPN connection

by Rabbit_Runner In reply to NT4 Server not answering ...

Hi, I believe that your problem is NAT (Network Address Translation) This means that your private IP address of your server, is being translated to a public IP address at your D-Link. VPN does not work well with NAT. I have heard of solutions, but they do not appear to be cheap. Sorry to give you the bad news.

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NT4 Server not answering VPN connection

by todd In reply to NT4 Server not answering ...

Poster rated this answer

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NT4 Server not answering VPN connection

by NetTek In reply to NT4 Server not answering ...

Your firewall must have protocol 47 and TCP port 1723 open to pass PPTP traffic. Also, check to see if PPTP filtering is active on the server (it is by default if your RAS server is also acting as a Proxy server). You can stop PPTP filtering by using the command
NET STOP RASPPTPF.
However, I believe this would also disable the Proxy. If you want to have both a proxy server and a VPN, go to the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RASPPTPF\
Parameters Registry key, and createthe value entry AllowPacketsForLocalMachine of REG_DWORD data type 1.

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NT4 Server not answering VPN connection

by todd In reply to NT4 Server not answering ...

The question was auto-closed by TechRepublic

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NT4 Server not answering VPN connection

by henrywi In reply to NT4 Server not answering ...

Cause: Remote access is not turn on on the VPN server.

Solution: Turn on remote access on the VPN server.

Click Start to access the Windows .NET Help and Support Center.
Cause: PPTP or L2TP ports are not turn on for inbound remote access requests.

Solution: Turn on PPTP or L2TP ports, or both, for inbound remote access requests.

Click Start to access the Windows .NET Help and Support Center.
Cause: The LAN protocols used by the VPN clients are not turn on for remote access on the VPN server.

Solution: Turn on the LAN protocols used by the VPN clients for remote access on the VPN server.

Click Start to access the Windows .NET Help and Support Center.
Cause: All of the PPTP or L2TP ports on the VPN server are already being used by currently connected remote access clients or demand-dial routers.

Solution: Verify that all of the PPTP or L2TP ports on the VPN server are not already being used by clicking Ports in Routing and Remote Access. If the number ofPPTP or L2TP ports permitted is not high enough, change the number of PPTP or L2TP ports to permit more concurrent connections.

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NT4 Server not answering VPN connection

by todd In reply to NT4 Server not answering ...

All of the solutions were already done.

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NT4 Server not answering VPN connection

by chetanpanse In reply to NT4 Server not answering ...

U are dialing from xp machine to nt machine.
1) first try connecting by using unsecured athentication.
2) then go to higher authentications.
3) nt may not support xp pptp, apply latest sp for nt 4.0.
4)678 - There is no answer. this is the problem. ras is not ansering to your xp machine. So start with unsecure athentication both sides .

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NT4 Server not answering VPN connection

by todd In reply to NT4 Server not answering ...

The question was auto-closed by TechRepublic

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NT4 Server not answering VPN connection

by todd In reply to NT4 Server not answering ...

This question was auto closed due to inactivity

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