VPN Error 720

VPN error 720 (No PPP Control Protocols Configured) may be encountered when the client connecting to a VPN server does not have the specific protocol to connect to the server. In order to solve this issue it is necessary to understand which exactly VPN protocols your VPN server supports and install the corresponding ones on a client computer.

VPN Error 720 while connecting to VPN

Practically everything you need to connect to a virtual private network is already installed in Windows, so there are probably some problems with your connection settings or network drivers. Let’s start with creating a new connection with default values. Try to connect to a VPN server with the same login and password you used previously. If you still encounter error 720, resetting the TCP/IP stack may help. Click Start, choose Run, type “cmd”, click “OK”, and in the opened window type “netsh int ip reset >> resetIP.log” and hit Enter. When you open the just created fule resetIP.log, it should show something like: Reseting Global, OK! Reseting Interface, OK! Reseting Unicast Address, OK! Restart the computer to complete this action. After that restart and try connecting to the VPN. Most probably you will not encounter VPN error 720 this time.

If the error still exists, you may go for some hardcore actions – reinstalling TCP/IP protocol. But be sure you are qualified enough, as with wrong actions you may lose your internet connection. Use it on your own risk. And better print out this page before proceeding. Also be very careful while editing your Registry, as wrong actions may cause serious problems which may lead even to Windows reinstallation.

1. Lets first of all uninstall the TCP/IP protocol. In Control Panel, double-click Network and Dial-up Connections, right-click Local Area Connection, and then click Properties. Under Components checked are used by this connection, click Internet Protocol (TCP/IP), and then click Uninstall. Follow the on-screen instructions to uninstall TCP/IP. When prompted restart the computer, but click No if you are prompted to allow Windows to enable a protocol.

2. After your computer restarted, right-click My Computer, and then click Properties. Click the Hardware tab, and then click Device Manager. On the View menu, click Show hidden devices.

3. Under Network adapters, there should be no WAN Miniport IP devices. If a WAN Miniport IP device is listed, continue to the following step. If no WAN Miniport IP device is listed, go directly to step 9.

4. Click Start, click Run, type regedit and then click OK. This will start the Registry Editor. Be very careful here, remember?

5. Locate the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}

* It is very recommended to backup your Registry right now, so you can restore everything just clicking the backup-registry.reg file. On the Registry menu, click Export Registry File, type backup-registry in the File name box, and then click Save.

6. Click each of the registry subkeys under this key, and then view the Data column of the DriverDesc value to determine which of the subkeys corresponds to WAN Miniport (IP). For example, the 0005 subkey.

7. Right-click the subkey whose DriverDesc value data is WAN Miniport (IP) (for example, right-click 0005), and then click Delete. Click Yes to confirm that you want to delete the key.Now quit Registry Editor and once again right-click My Computer, and then click Properties. Click the Hardware tab, and then click Device Manager. On the View menu, click Show hidden devices.

8. Under Network adapters, right-click WAN Miniport (IP) and then click Uninstall. Click OK to confirm that you want to remove this device.

9. Now let’s reinstall the TCP/IP protocol. In Control Panel, double-click Network and Dial-up Connections, right-click Local Area Connection, and then click Properties. Click Install. In the Select Network Component Type dialog box, click Protocol, and then click Add. Under Network Protocol, click Internet Protocol (TCP/IP), and then click OK. When the protocol is installed, click Close.

10. Reset your modem or router by turning the power off and then on. In case you have internal modem or if you are connecting to the Internet simply plugging in the Ethernet cable (without router), restart the computer.

11. Make sure the Internet connection is fine, try opening some websites.

Now create a new VPN connection and connect with your login and password.

This time you should not encounter VPN error 720.

Error 720 on a VPN Server

In case you are running your own VPN server and cannot connect to it receiving error 720, the solution is much more simple. The problem is probably within your incoming connections config which assigns wrong IP addresses to VPN clients. In order to fix it, open Network and Sharing Center and choose Change Adapter Settings. After that right click on Incoming Connection and open Networking tab. Make sure Internet Protocol Version 4 (TCP/IPv4) checkbox is picked.

VPN error 720 on a VPN server

Now we need to make sure the IP addresses are assigned correctly. Choose Specify IP addresses option and specify some IP range which is within the IP range assigned by your router. Your LAN is most probably on 192.168.0.1-254 network. To theck it click Start, choose Run, type “cmd”, click “OK”, and in the opened window type “ipconfig” and hit Enter. You will see your network IP address. Let’s give an example of 192.168.11.x network. In this case you should submit something like that:

VPN error 720 - assigning IP range

Before clicking OK make sure the IP range you specified does not conflict with any existing devices in the network (like your own computer or network printers). Now your problem with VPN Error 720 on your VPN server must be solved.