Error 721 When Trying To Connect To Vpn
Contents |
I have FINALLY resolved an ongoing issue with our VPN connections that we have been experiencing for over a year
Error 721 Vpn Windows Xp
now. I will share these findings with this forum in case error 721 directv 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, 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, 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 simpl
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 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 a question Anybody can answer The http://www.pcreview.co.uk/threads/error-721-finally-resolved.1574450/ 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 try to connect, I get the error "Disconnected. http://serverfault.com/questions/110009/vpn-returning-721-error-despite-successful-logins-to-from-other-locations 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 stumped - we know each end is fine independently, but for some reason they won't work
not post a blank message. Please type your message and try again. This discussion is locked Shurafa Level 1 (0 points) Q: Error 721 When connecting to VPN using an Airport Extreme I would like to set it up as a gateway https://discussions.apple.com/thread/1193510?tstart=0 on a network with a windows server that will handle the DNS and DHCP http://www.howtonetworking.com/vpnissues/error721.htm as well as RAS. There does not seem to be an option to turn off DHCP do I setup a scope of 192.168.57.1-192.168.57.2 with a lease time of 9999 days. Now the main problem occurs when trying to dial into the server remotely. The VPN client returns an error 721. This error typically indicates that the client is error 721 talking to the server however it cannot authenticate properly. I have setup port mapping to the server for 1723 and 1701 however it will not connect. Typically enabling ipsec will fix this error however I do not see that option. When I "enable default host" and point it to the server it works however this is not acceptable as is a major security risk as well as limits the ability to forward error 721 when additional ports to other servers. Am I missing something? Many, Mac OS X (10.4.10) Posted on Oct 24, 2007 8:32 PM I have this question too Close Q: Error 721 When connecting to VPN using an Airport Extreme All replies Helpful answers by Neil D'Souza, Neil D'Souza Nov 3, 2007 6:48 AM in response to Shurafa Level 1 (5 points) Nov 3, 2007 6:48 AM in response to Shurafa It looks like GRE has to be forwarded. GRE is IP Protocol 47. PPTP uses GRE for tunneled data. Type "error 721" in google and you'll get solutions. Helpful (0) Reply options Link to this post by Radar4077, Radar4077 Nov 4, 2007 5:56 AM in response to Neil D'Souza Level 1 (0 points) Nov 4, 2007 5:56 AM in response to Neil D'Souza I get the same error 721 when trying to connect a windows pc and a mac via vpn at the same time. It is always "first come, first served", the second connection is denied. Can i solve my problem as well with the solution suggested? Helpful (0) Reply options Link to this post by Neil D'Souza, Neil D'Souza Nov 4, 2007 6:05 AM in response to Radar4077 Level 1 (5 points) Nov 4, 2007 6:05 AM in response to Radar4077 Possibly. Microsoft
To New Topics Error 721: Remote PPP peer or computer is not responding. Resolution: If you have tried many thing other people suggest like rebooting, reloading hardware and re-installing the VPN or dial in connection, you still get the same problem. I will suggest to check the router settings and make sure TCP Port 1723, IP Protocol 47 (GRE) are opened. Also make sure that the router has the PPTP enabled and not firewall block the traffic. On the RAS server, check the DHCP settings. Post your questions, comments, feedbacks and suggestions Related Topics VPN error code VPN Browsing Issues VPN Logon Issues VPN Name Resolution VPN as Router VPN Routing Issues VPN TCP/IP Settings Ports for VPN VPN/PPTP VPN Slow Issues Previous Page Next Page This web is provided "AS IS" with no warranties. Copyright © 2002-2015 ChicagoTech.net, All rights reserved. Unauthorized reproduction forbidden.