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Error attepting to connect to PPTP VPN on W2K Server running RRAS.

Posted on 2004-04-26
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Last Modified: 2010-04-12
I am trying to implement a VPN PPTP server on Win2K server using RRAS in a workgroup. AD is not installed. The system has 2 NICs. The first one is connected directly to the internet and has a public IP address via DHCP. The second NIC is connected via another ISP using a Netopia router that is mapping public IPs to the private internal addresses it is assigning via DHCP. It has no security. At present this nic has a 192.168.1.27 address and a public address is mapped to it. My problem is when I try to connect using a Win2K pro workstation remotely through the 1st NIC, it begins authentication and then stops responding and gives a 721 error. Please advise.
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Question by:rwjean
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by:ewtaylor
ID: 10963576
Make sure the firmware on the netopia is up to date.
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Expert Comment

by:ewtaylor
ID: 10963583
Also make sure vpn passthrough is enabled on the remote connection router.
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by:rwjean
ID: 10966006
The router is utilizing IP maps which map the public IPs to the private internal addresses. So in my case, the public IP is mapped to 192.168.1.27. There is no blocking of ports whatsoever. The machine at that address is wide open.
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by:ewtaylor
ID: 10981626
I thought the first nic was connected directly to the internet? You are running no domain just workgroup?
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by:rwjean
ID: 10989011
The first nic has a public address via dhcp from Comcast. The second is statically assigned an 192.168.1.27 address and the router does a static IP map to that address.
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ewtaylor earned 300 total points
ID: 10989108
Are you running service pack 3 or 4 on the client? I wonder if you are connecting via the comcast interface and the server is replying via the netopia interface, the vpn client sees this as a different ip address and drops the packet.  Kind of like this situation
http://support.microsoft.com/default.aspx?kbid=810839
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