Error 721 Vpn Connection
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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:
Error 721 The Remote Computer Did Not Respond
It can take up 6 retries for any remote user to successfully created a remote PPTP vpn connection error 800 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
Error 721 Vpn Windows Xp
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 a lot of bandwidth, hence the need for linksys vpn error 721 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. We have approximately 32 public IP addresses, hence why we use Multi-NAT for error 721 vpn verifying username and password 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 end I don't know whether it's a router issue (ie, Netopia has problems routing PPTP requests), or a protocol issue (PPTP has problems when NATed),
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Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about http://serverfault.com/questions/110009/vpn-returning-721-error-despite-successful-logins-to-from-other-locations hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question http://www.tomshardware.com/forum/144562-45-worked-suddenly-anymore-error _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top VPN returning 721 error despite successful logins to/from other locations up vote 2 down vote favorite I am error 721 trying to connect a couple of Win XP desktops at a remote site, to the server (SBS 2008) of a central site, using a PPTP based VPN. When I try to connect, I get the error "Disconnected. Error 721: The remote computer did not respond." Here is the strange part: The remote PCs can successfully dial out to another server using VPN. Similarly, I can successfully dial into the central site from my work PC. The remote computers are error 721 vpn dialling out through a Netgear DG834Gv4 (latest firmware), and the server is behind a Draytek 2820. I have also tried using the Draytek as the VPN endpoint (instead of it doing pass-through), which again worked successfully from my work PC, but gave the same result from the remote site. I can ping the central site from the remote one, no problem. I can also telnet into port 1723 from the remote site. The central server is a domain controller with AD. At some point in the past, the remote PCs were successfully logged onto the domain, so now log into that (but obviously can't connect). The remote PCs are on a network which contains another SBS 2008 domain/domain controller/AD/server. However, the remote PCs are using the DG834 as their DNS/DHCP/etc. I and my colleagues are totally stumped - we know each end is fine independently, but for some reason they won't work together. We don't think that it's authentication; it doesn't seem to get that far. There's nothing in either router's firewall which would prevent one the remote IP but not my work IP. The MTU of the DG834 has been changed to match the Draytek. Any ideas? vpn pptp share|improve this question asked Feb 5 '10 at 15:28 Andrew C Ok, I've tested the VPN from one of the PCs from the other domain which is at the remote site, and it has th
Gaming Smartphones Tablets Windows 8 PSUs Android Your question Get the answer Tom's Hardware>Forum>Windows XP>VPN Worked, Suddenly It does not anymore. Get Error 721> VPN Worked, Suddenly It does not anymore. Get Error 721 Tags: Connection VPN Windows XP Last response: 14 August 2004 03:31 in Windows XP Share Anonymous 13 August 2004 06:11:33 Archived from groups: microsoft.public.windowsxp.work_remotely (More info?) Hello everyone, My WIN XP PRO VPN connection worked perfectly for almost a month and now it decided not to work. It's the darnedest thing and I hope you all can help. I click on the VPN connection and it finds the address, but then it gets stuck on the "Verify username and password" after about 20 seconds I get an error 721 pop up. This connection worked great just last week and now it does not. I have deleted it, restarted the host computer, and created the connection again, but nothing happened I would get the same error. I have ports 1723 and 47 open in my router. I have no idea why it does not work now. I would appreciate any help at all as I am sure this is a simple matter to fix as all of my problems are. Thank you in advance. More about : vpn worked suddenly anymore error 721 Anonymous 13 August 2004 08:51:47 Archived from groups: microsoft.public.windowsxp.work_remotely (More info?) You are the third person this past week who has had this issue... Hmmm... What router do you have? If it is a MS router, did you let it autoupdate itself? Also, have you applied any new security hotfixes lately? Jeffrey Randow (Windows Networking & Smart Display MVP) jeffreyr-support@remotenetworktechnology.com Please post all responses to the newsgroups for the benefit of all USENET users. Messages sent via email may or may not be answered depending on time availability.... Remote Networking Technology Support Site - http://www.remotenetworktechnology.com Windows XP Expert Zone - http://www.microsoft.com/windowsxp/expertzone On 12 Aug 2004 18:11:33 -0700, aspireasset@hotmail.com (Alan S.) wrote: >Hello everyone, > My WIN XP PRO VPN connection worked perfectly for almost a month and >now it decided not to work. It's the darnedest thing and I hope you >all can help. I click on the VPN connection and it finds the address, >but then it gets stuck on the "Verify username and password" after >about 20 seconds I get an error 721 pop up. This connection worked >great just last week and now it does not. I have deleted it, restarted >the host computer, and created the connection again, but nothing >happened I would get the same error. I have ports 1723 and 47 open in >my router. I have no idea why it does not work no