Error 720 on VPN (PPTP) attempt
Just to begin, I've read this post and feel it is not exactly applicable to my situation. When I attempt to connect to a server running XP x64 (so essentially Server 2003) using a PPTP connection, it fails with client-side error Registering your computer on the network... Error 720: A connection to the remote computer could not be established. You might need to change the network settings for this configuration. and server-side error Event ID: 20050 The user WINSERV3\Andy connected to port VPN8-1 has been disconnected because no network protocols were successfully negotiated. I have configured the router to pass both TCP packets on 1723 and GRE packets. I have used Wireshark (filtering out ARP, UDP, and all TCP ports other than 1723) to observe the packets received by the server. Wireshark does not explicitly name any protocol GRE, but it does tell me the server sent and received TCP, PPTP, PPP LCP, PPP CHAP, PPP CBCP, and PPP IPCP. The connection seems to go wrong at packet 30, where the protocol is PPP LCP, with the payload of the packet being labeled "Protocol Reject". Obviously, this is going from server to client. This would seem to lead to the conclusion that there is something wrong with my client, which runs Windows 7 Ultimate x64. However, it is able to connect to my house's router, which runs the DD-WRT firmware and is thus a PPTP endpoint. I'm thoroughly at a loss. Please help!
March 25th, 2010 1:25am

Hi, Based on my research, I suggest you try the suggestion from the link below: Event ID 20050 — RAS Connection Thanks, Novak
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March 26th, 2010 4:26am

Hi, That link is for server 2008 -- there is no rrasmgmt snapin in either my client or server computer.
March 26th, 2010 6:22am

Routing and Remote Access (rrsmgmt) also exists in Windows 2003 Server machine. Please verify its settings on the server machine. For more information about Routing and Remote Access, please refer to the link below: Routing and Remote Access Thanks, Novak
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March 30th, 2010 3:55am

I, however, am running XP x64. While internally it shares more with Server 2003 than it does with XP, it lacks many of the administrative tools in Server 2003. To wit, there is no RRASMGMT.MSC snap-in. I even tried copying it off the Server 2003 disk and uncompressing it but Windows fails to load the snap-in.
April 6th, 2010 9:12pm

just change DHCP provider in RAS server
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December 29th, 2010 7:08pm

The problem seems to be in IP addresses assigning. For everyone who had error 720, hehre is a comprehensive manual to solve it: http://www.vpnserverwindows7.net/vpn-error-720/
July 5th, 2012 4:55pm

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