Error 721 The Remote Computer Did Not Respond. Xp
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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 https://support.microsoft.com/en-us/kb/888201 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 http://www.pcreview.co.uk/threads/error-721-finally-resolved.1574450/ 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 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 servi
| 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 http://forums.isaserver.org/Disconnected%25_Error_721%25_Remote_computer_did_not_respond%25/m_130177900/tm.htm Printable Version All Forums >> [ISA Server 2000 Firewall] >> VPN >> Disconnected. Error 721. https://forums.virtualbox.org/viewtopic.php?f=4&p=67599 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 error 721 SBS SP4) using ISA.I keep getting this 721 error though.The machine seems to connect 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 error 721 the see what else I am missing.The internet connection for the server is via an ADSL USB modem.Any advice or suggestions would be 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 2
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