While setting up a Virtual Private Network (VPN) connection on your Windows 7 machine, you may experience error 720, which indicates something went wrong while connecting to the Remote Access Service (RAS). Corrupt TCP/IP settings, outdated driver software, and corrupt registry are among a few reasons which cause the error to occur during the VPN connection setup. If you won’t immediately tend to the problem, it may harm your computer.
To make VPN work, make sure that the TCP/IP IPv4 protocol is enabled while the IPv6 one should be disabled. If it’s not enabled, do so by navigating to Network and Sharing Center (the icon in the system tray)> Change Adapter Settings> right click Incoming Connection and select Properties> highlight the Networking tab> select the Internet Protocol Version 4 (TCP/IPv4) box and uncheck the IPv6 box. Now you must right click (or double click) the Internet Protocol Version 4 (TCP/IPv4) option and select Properties.
In the Internet Protocol Version 4 (TCP/IPv4) Properties window, select the Specify IP Addresses button and start filling up the IP address information. In the From and To boxes, fill up the range of your network’s IP address (of your router. For e.g. your LAN operates from 192.168.11.11 to 192.168.11.35). You can obtain the IP address range by running the ‘ipconfig’ command in Command Prompt. You can also check out your router setup manual for more information about the IP address or contact your router technical support to obtain this information. Click OK to save changes and exit the Properties window. Click OK again to exit the previous window. If prompted, restart your computer.
You can also reset the TCP/IP stack to fix the error. Click the Start button> All Programs> Accessories> Command Prompt. Type ‘netsh int ip reset c:\netsh.log.txt’ and hit Enter. When prompted, restart your computer. If resetting the TCP/IP stack doesn’t work, open Command Prompt again and type ‘netsh winsock reset’. Hit Enter to execute the command. Restart your computer. It will now reset the Winsock settings and make way for the successful VPN connection setup.
Outdated driver software has also been named as one of the reasons for the error 720. So, you must update drivers for your devices like printer or wireless router etc. You can download latest updates from your hardware manufacturer’s website or search for them with Windows Update also. I would recommend you checking out the manufacturer’s website for the updates. Windows updates often result in problems so, it’s better to go with the driver software updates from the hardware manufacturer’s website.
Corrupt registry can also cause error 720 to hit your Windows 7 computer. To clean and repair Windows 7 registry, you will need to run a registry cleaner software. You can choose to download a free or paid tool as desired. Keep one thing in mind that a registry cleaner software will most certainly be different from the registry repair software. You can download a software that not only cleans your registry but also repairs it.
You should also run a full virus scan on your computer to make sure that it’s not running any malicious software application. You should also update your antivirus program regularly to make sure that it’s running the latest virus, malware definitions to detect and block the ever-growing threats.
Though it’s not recommended but you can also turn off your firewall temporarily while setting up the VPN connection. Do not forget to turn on your firewall back once you are done with the setup. Port forwarding or enabling blocked ports on your router might also help you get rid of the problem. After you have run one of or all these solutions, you should be able to set up your VPN connection without facing the Error 720. In the problem persists, you should contact Windows 7 technical support.