Error 721 The Remote Computer Did Not
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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 a lot of bandwidth, https://support.microsoft.com/en-us/kb/888201 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. We have approximately 32 public IP addresses, http://www.pcreview.co.uk/threads/error-721-finally-resolved.1574450/ 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 end I don't know whether it's a router issue (ie, Netopia has problems ro
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 http://serverfault.com/questions/110009/vpn-returning-721-error-despite-successful-logins-to-from-other-locations of this site About Us Learn more about Stack Overflow the company http://www.computerfixitshop.com/windows-error-721-the-remote-computer-did-not-respond.php Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ 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 error 721 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 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 error 721 the 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 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 stu
Did Not Respond? Don't Worry - I'm here to help you fix it! Causes of the error: Windows Windows Error 721 The Remote Computer Did Not Respond are caused by misconfigured system files. So, from my experience, If you received a Windows Error 721 The Remote Computer Did Not Respond message then there is a 97.5% chance that your computer has registry problems. The Windows Windows Error 721 The Remote Computer Did Not Respond are easy to repair. By downloading and running the registry repair tool RegCure Pro, you can quickly and effectively fix this problem and prevent others from occuring. Simply click the links below for your free download. To Fix the problem you need to follow the 3 steps : STEP 1: Download & Install RegCure Pro for Free. NOTE: If the download link doesn't work you may need to Download it Directly from a Mirror Here. STEP 2: Click "Quick Scan" Button to Scan Your Computer. STEP 3: Click the "Repair All" Button to Repair Your PC! That's All! Scott Chan Technical Description of System Error(for Experts only): Microsoft Windows [Version 5.2.4630] (C) Copyright 1985-2014 Microsoft Corp. C:\Documents and Settings\Administrator>RegCure Pro.exe Windows Windows Error 721 The Remote Computer Did Not Respond may caused by some of the following errors Windows Explorer ErrorsJavascript ErrorsHardware MalfunctionError Symptom include:Can not printing fileBlue ScreenIO errorShutdown problemsHttp error Tags: Windows Windows Error 721 The Remote Computer Did Not Respond 4 Response to “RegCure Pro ” DominicaSays: at 9:22 PM Thank you so much! After spending countless hours on this stupid windows error 721 the remote computer did not respond problem I almost gave up. RegCure worked like a charm on the first try. It took a bit longer than 10 minutes, closer to 30, but by the time it was finished my PC worked great again. Merle Says: at 3:47 AM Just ran this on my wife's computer and for the first time in a long time, it finally works again! Regcure found over 2500 errors including the Windows Error 721 The Remote Computer Did Not Respond and fixed them all. I'm not a PC guru by any stretch, but this was a godsend. Cheers! Gary Says: at 4:48 AM worked just like it said. no more errors and officially back in action. ty ty ty Lynsey Says: at 9:12 AM it worked!!!!!!! Download Now: Windows Error Repair Tool *RegCure Pro will repair Windows Error and registry data errors on your PC Compatible with ALL Versions of Windows Including Windows 7 and 8 Posted by: Jacqualine Common Symptoms Windows Error 721 The Remote Computer Did Not Respond sym