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Protocol (PPTP) client. You may even get an error 721 after making an unsuccessful attempt to establish a dial-up connection after upgrading your computer to Microsoft Windows XP from vpn error 718 earlier versions. The exact error 721 description may vary from 'Remote PPP peer error 777 modem out of order is not responding' to 'the remote computer is not responding'. Cause of Error 721 Point-to-Point Tunneling Protocol uses Generic Routing error 777 reliance netconnect Encapsulation (GRE) for tunneled data and the error may occur if the network firewall does not permit the GRE protocol traffic. The Generic Routing Encapsulation protocol is used along with Point-to-Point Tunneling Protocol https://support.microsoft.com/en-us/kb/318009 to create virtual private networks between the server and the client or between the clients. You may even encounter this error if the modem driver is not compatible with Windows XP. How to fix the Error 721 To resolve this error, you need to configure the network firewall so as to permit the GRE protocol 47. Also, you need to make sure that the firewall permits http://www.tech-faq.com/error-721.html the TCP traffic on port 1723. Both of these conditions are required in order to establish the virtual private network connectivity by using Point-to-Point Tunneling protocol. Installing the latest Windows XP compatible driver for the modem can also fix the problem in some situations. Follow Us! Rate this article: ★ ★ ★ ★ ★ Error 721, 0 / 5 (0 votes) You need to enable JavaScript to vote Mail this article Print this article Last updated 11 March, 2016. Related Posts SVCHOST.EXE Application Error Svchost.exe is a system process that handles the processes executed from the dynamic-link libraries (DLLs). ... Bad_Pool_Header One of the most famous fatal errors that occurs on computers running the Windows Operating ... How to Fix Error 0x80070570 Error code 0x80070570 is one of the most common errors on computers. The error typically ... rejohn Long Path Tool help me a lot when i have an issue like file deleting or renaming the file. Also good to use if file name and file extension is too long. frederik "Long Path Tool" is very helpfull Search for: ReferenceSoftware Tutorials Unit Conversion Practice Tests Web Tools Site Index Audio-Video Databases Electronics File Compression File Con
Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks. Windows 7 http://www.sevenforums.com/network-sharing/93003-vpn-gurus-error-721-a.html Help Forums Windows 7 help and support Network & Sharing » User Name Remember Me? Password Advanced Search Show Threads Show Posts Advanced Search Go to Page... Windows 7: VPN Gurus: error 721 23 Jun 2010 #1 BigJohnny Win7 8 posts VPN Gurus: error 721 hi, i wanted to implement a vpn connection using microsoft technology. i enabled ras on the host computer which has win vpn error 7. the host computer sits behind a di-524 router, so i've enabled pptp pass through and ipsec pass through, moreover, i set a port forwarding for 1723 and 500 (both tcp and udp) to the host computer. from the guest computer, who sits in a different subnet and uses win xp, i used telnet to verify that the host server can be reached, there was no problem reaching it. then vpn error 721 i verified the generic routing encapsulation (gre) is set too, so i've used pptpclnt and pptpserv, and gre check complete successfully. still, when i set a vpn dialup connection, i get error 721 (after verifying username and password). any vpn guru can help me here? thanks. My System Specs OS Win7 BigJohnny View Public Profile Find More Posts by BigJohnny . 23 Jun 2010 #2 chev65 Windows 7 Ult, Windows 8.1 Pro, 9,149 posts San Diego I received error 721, which says the remote computer is not responding. Cause: This issue can occur if the network firewall does not permit GRE traffic (IP protocol 47). PPTP uses GRE for tunneled data. Solution: Configure the network firewall between the VPN client and the server to permit GRE. In addition, make sure that the network firewall permits TCP traffic on port 1723. Both of these conditions must be met to establish VPN connectivity by using PPTP. For more information, see article 888201, "You receive an "Error 721" error message when you try to establish a VPN connection through your Windows Server-based remote access server" in the Microsoft Knowledge Base. Troubleshooting remote access VPNs: Virtual Private Network (VPN) This is what comes up for error 721. Hope i