Error 721 Remote Computer Not Responding
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| Address Book | Member List | Search | FAQ | Ticket List | Log Out Disconnected. Error 721. Remote computer did not respond. Users viewing this topic: none Logged in as: Guest Tree Style Printable Version All Forums >> [ISA Server 2000 Firewall] >> VPN >> Disconnected. Error 721. Remote computer did not respond. Page: [1] Login Message << Older Topic Newer Topic >> Disconnected. Error 721. Remote computer did not respond. - 30.Aug.2003 6:19:00 PM scriven_j Posts: 8 Joined: 30.Aug.2003 From: London Status: offline Hi,I am trying to get a VPN running between a client machine (Windows XP SP1) and a server machine (Windows 2000 SBS SP4) using ISA.I keep getting this 721 error though.The machine seems to connect https://support.microsoft.com/en-us/kb/888201 and states that it is 'verifying username & password' but then it sits their for about a minute and then comes up with the error.I am able to connect to the ISA machine using Terminal Services (Remote Desktop Connection) without any problems.I have run the wizard and it has created two IPSec & two PPTP packet filters but I cannot see what else I am missing.The internet connection for the server is via an ADSL USB modem.Any advice or suggestions would be http://forums.isaserver.org/Disconnected%25_Error_721%25_Remote_computer_did_not_respond%25/m_130177900/tm.htm much appreciated ! Thanks !Jon [ August 30, 2003, 06:26 PM: Message edited by: scriven_j ] Post #: 1 Featured Links* RE: Disconnected. Error 721. Remote computer did not re... - 31.Aug.2003 7:55:00 PM tshinder Posts: 50013 Joined: 10.Jan.2001 From: Texas Status: offline Hi Jon,Does your ISP allow inbound VPN connections?Thanks!Tom (in reply to scriven_j) Post #: 2 RE: Disconnected. Error 721. Remote computer did not re... - 1.Sep.2003 10:40:00 AM scriven_j Posts: 8 Joined: 30.Aug.2003 From: London Status: offline I have worked it out. I was sniffing the wrong lamppost !The VPN works fine - The place where I was trying to test it was blocking the GRE packets. Once I tried it from home, it worked without a problem.Thanks !Jon (in reply to scriven_j) Post #: 3 RE: Disconnected. Error 721. Remote computer did not re... - 1.Sep.2003 6:09:00 PM tshinder Posts: 50013 Joined: 10.Jan.2001 From: Texas Status: offline Hi Jon,"sniffing the wrong lamp post" Good to hear you got it working and thanks for the follow up!Tom (in reply to scriven_j) Post #: 4 Page: [1] << Older Topic Newer Topic >> All Forums >> [ISA Server 2000 Firewall] >> VPN >> Disconnected. Error 721. Remote computer did not respond. Page: [1] Jump to: Select a ForumAll Forums---------------------- [Threat Management Gateway (TMG) 2010] - - General - - Installation [Forefront Unified Access Gateway 2010] - - General - - Installation -
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and http://serverfault.com/questions/110009/vpn-returning-721-error-despite-successful-logins-to-from-other-locations 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 error 721 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 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 the remote computer 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 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 coll