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I have FINALLY resolved an ongoing issue with our VPN connections that we have been experiencing for over a year now. I will share these findings with this forum in case others can benefit from our situation. First let me explain the problem. The Problem: It can take up 6 retries for any remote user to successfully created a remote PPTP connection to our servers. Whenever we try to connect it display the following message: Verifying username and password... And it sit there displaying this message for about 30-40 seconds, then it says: "error: 721 The remote computer did not respond." Network Setup: We have two netopia routers on our network. They both have their own separate WAN connection (we use https://support.microsoft.com/en-us/kb/318009 a lot of bandwidth, hence the need for two WAN connections). One RAS server is configured to use one router as it's gateway, and the other RAS server uses the second router as it's gateway. When PPTP connections are made, the connection comes in and back out the same router (this I made sure). We use a multi-NAT for routing service request to internal servers. FTP, WWW, RDP, PCAnywhere, SSL, PPTP, MAIL, etc...all these services are routed to internal servers/workstations. http://www.pcreview.co.uk/threads/error-721-finally-resolved.1574450/ We have approximately 32 public IP addresses, hence why we use Multi-NAT for routing public services to internal servers. Everything works perfectly, EXCEPT PPTP (VPN) connections. We have struggled with this for a year now. For whatever reason, it struggles to make a successful connection to our RAS servers. Like I said, it can take up to 6 retries to successfully connect to our RAS servers (up to 30 retries if the remote user is behind a Linksys router). The Fix: Today, I decided to try something different. I decided to use the router's public IP address for PPTP requests, instead of one of the other public IP addresses our ISP assigned us, and simply forward PPTP (TCP 1723 & IP 47) requests to the internal servers. Therefore, the only difference is that I am using a pingable IP address which happens to belong to the router instead of using one of the public IP addresses I have NATed. For whatever reason, this solved our problem with connecting to the RAS server. We no longer have to retry up to 6 times to successfully connect. Conclusion: I have NO clue as to why I have to use the router's public IP address rather than any of the other 31 public IP addresses our ISP assigned to us. This was ONLY an issue with the PPTP service. All the other services work perfectly with the router's Multi-NAT table. In the
? Ask a question, help others, and get answers from the community Discussions Start a thread and discuss today's topics with top experts Blogs Read the latest tech blogs written by experienced community members Problem establishing VPN connection with http://itknowledgeexchange.techtarget.com/itanswers/vpn-error-721-2/ remote server Stevesz 2015 pts. Tags: Thanks! We'll email youwhen relevant content isadded and updated. Following Follow error 721 Thanks! We'll email youwhen relevant content isadded and updated. Following Follow VPN issue Thanks! We'll email youwhen relevant content isadded and updated. Following Follow Windows XP SP3 One machine is having a problem establishing a VPN connection with a remote server. It hangs on verifying the username and password. Another machine error 721 on the same network, using the credentials of the user who has the problem connects straight away. This has led me to believe that the problem is entirely with the one machine. I've updated the NIC driver with no success. I have created a new VPN connection but get the same results. I have even shut down the firewall on the local machine without gaining anything. This connection was working in error 721 microsoft the past. I have not been able to put a finger on the problem and I am looking at doing a complete re-install of the OS right now. The error returned is "721: The remote computer did not respond." I did check ADUC and the user is allowed to connect remotely. Does anyone have any suggestions?Software/Hardware used: Windows XP SP3, Microsoft VPN Client Asked: February 25, 20119:40 PM Last updated: June 27, 20134:57 PM Related Questions Cisco VPN Client error message Cisco VPN Concentrator 3000 Issue VPN Problems with SBS 2003 Cisco pix vpn access How can i connect my windows XP machine to a remote office? Answer Wiki Last updated: June 27, 20134:57 PM GMT Michael Tidmarsh48,715 pts. History Contributors Ordered by most recent Michael Tidmarsh48,715 pts. Mariodlg2,790 pts. Thanks. We'll let you know when a new response is added. I had similar troubles when I installed a program to manage voip comunication inside the company. This software had installed another network interface and that was the problem. Once uninstalled I have been able to connect to the vpn network again. Another software who creates network interfaces are virtual machines managers like VirtualBox or VMWare. Search for a recent change in any of the interfaces of the machine with troub