Error 721 The Remote Computer Did Not Respond
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Verizon Error 721 The Remote Computer Did Not Respond
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Error 678 The Remote Computer Did Not Respond
of this site About Us Learn more about Stack Overflow the company Business error 721 vpn windows xp Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question error 721 directv _ 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 https://support.microsoft.com/en-us/kb/318009 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 try http://serverfault.com/questions/110009/vpn-returning-721-error-despite-successful-logins-to-from-other-locations 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 stumped - we
for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Expand https://www.experts-exchange.com/questions/21334514/VPN-question-error-721-Remote-computer-did-not-respond.html Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions > VPN question - "error 721: Remote computer did not respond" Want to Advertise Here? Solved VPN question - "error 721: Remote computer did not respond" Posted on 2005-03-02 Software Firewalls Hardware Firewalls Networking 3 Verified Solutions 11 Comments 34,429 Views Last Modified: 2013-11-16 I'm trying to setup VPN against error 721 a Windows 2003 server. Client is XP pro. The server is behind a router that run NAT. When I'm connecting to the VPN server directly to the internal IP I connnect without problems. Our ISP have setup the NAT on the router to temporarily allow all IP traffic to this external IP. But when I try to VPN connect to external IP it hangs with message "verifying username/password" and then I get "error remote computer did 721: Remote computer did not respond". Any ideas what might be wrong? Are any particular settings on the router needed to make this work? 0 Question by:rj2 Facebook Twitter LinkedIn Google LVL 16 Best Solution bysamccarthy You will need to verify that the ISP is letting the traffic IN from the external IP. You need to allow port 1723 TCP for PPTP and GRE, IP Protocol 47. You will also need to port forward 1723 to the Go to Solution 11 Comments LVL 16 Overall: Level 16 Networking 6 Software Firewalls 4 Hardware Firewalls 3 Message Accepted Solution by:samccarthy2005-03-02 You will need to verify that the ISP is letting the traffic IN from the external IP. You need to allow port 1723 TCP for PPTP and GRE, IP Protocol 47. You will also need to port forward 1723 to the Nat IP address of the Windows 2003 server doing the VPN. So, your external client sends a VPN request to the external IP. The router sees this on port 1723 and then will forward that on to the IP address of your server. 0 LVL 10 Overall: Level 10 Message Author Comment by:rj22005-03-02 Well, the ISP says that they believe everything is ok on the router, and it is setup according to the url below. http://cisco.com/en/US/tech/tk827/tk369/technologies_conf