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Troubleshooting VPN Setup


Troubleshooting FAQ:

To use PPTP VPN service, you are required to connect to the VPN server. The connection is automatic after you have setup VPN connection in your laptop. All you need to do is dial up the VPN connection to connect to the VPN server. Sometimes you may encounter an error while establishing a VPN connection. Let’s take a look at some common VPN connection errors and their simple solutions.

  • Error 800: Unable to establish the VPN connection

The error 800 can be due to any reason such as wrong server address, network firewall blocking the VPN connection or it may be a temporary problem with the VPN server.


  • Check if you are using the right server name provided by your service provider

  • Ensure your internet connection is working properly. Check your modem or router lights to check the internet connection

  • Ping the VPN server. You can either ping the server using name or the IP address. The results will show if the Server is working properly.

  • Your antivirus might be blocking the VPN connection. Disable it temporarily and try connecting to the VPN server.

  • Error 619: A connection to the remote control could not be established

The error is mainly caused when the operating system blocks the port 1723 used for establishing a VPN connection


  • Disable the firewall and antivirus temporarily as they are known to block the port.

  • If you are still not able to establish a VPN connection. Reboot the system and try again

  • If you are using a router, then reboot it and ensure you have enabled the option “VPN Passthrough” in your router settings

  • Reason 442: Failed to enable virtual adapter

The error is mainly caused when the Windows 7 detects a duplicate IP address.


  • Open “Network and Sharing center

  • Select “Manage Network connections”

  • Enable the virtual adapter

  • Right click on VPN Adapter, and choose “Diagnose” from the context menu

  • Select “Reset the Network Adapter Local Area Connection X” (Note: X represents the number of the Local Area Connection related to VPN Adapter)

If the above steps do not work, you can try resetting the adapter from command prompt

reg add HKLM\System\CurrentControlSet\Services\Tcpip\Parameters /v ArpRetryCount /t REG_DWORD /d 0 /f

Reboot the system. In majority of the cases the error caused by duplicate IP address is resolved.

  • Case 1 – Error 720: No PPP control protocols configured.

The error is caused when the RAS (Remote Access Server) is not configured properly, or if your computer and RAS do not have a common protocol


  • Click on the circular button with Windows logo in the task bar

  • Click on “Control Panel” -> “Network Connections”

  • Under Virtual Private Network, locate and right click the VPN connection

  • Click on “Properties”

  • In the next window, click the “Networking” tab. (Note: Ensure that you have a protocol set and RAS server is running)

If you have not set the protocol that RAS server is using, add the required protocol. To add protocol follow the given steps

  • Click Install->Protocol-> Add

  • Click the protocol you want to install

  • Click OK

  • In VPN Connection Properties window, click Close.

  • Case 2 – Error 720: the connection attempt failed because your computer and the remote computer could not agree on PPP control protocol.

The error is caused by the operating system’s inability to load WAN miniport IP device due to driver issues. You can see a yellow exclamation mark besides the icon WAN Miniport (IP) #2 device in the Device Manager window.


The solution to this problem is uninstalling TCP/IP protocol, removing the second WAN Miniport device and reinstalling TCP/IP protocol.

To uninstall TCP/IP protocol:

  • Go to “Control Panel”

  • Click on “Network and Dial-up Connections”

  • Right click on “Local Area Connection” and then click on “Properties”

  • In the next dialog box, locate “Internet Protocol(TCP/IP)”

  • Click on Uninstall and follow on-screen instruction to uninstall the protocol.

  • Restart the computer, if prompted. (Note: Click on No, if you are prompted to enable a protocol)

To uninstall WAN Miniport second device:

  • Right-click on “My Computer”

  • Click on “Properties”

  • Click on “Hardware” tab followed by “Device Manager”

  • Click on the “View” Menu

  • Click on “Show Hidden Devices”

  • Under Network Adapters, you will see a WAN Miniport (IP)#2 device listed

Note: In the next steps, you will be required to makes changes to the Windows Registry. Proceed with the given steps only if you have made changes the Registry in the past. Editing Registry in a wrong manner can cause serious problems and you may have to reinstall Windows OS again. To be on safer side, back up the registry before making any changes.

  • Click on Start->Run

  • Type regedit in the open box and click Ok

  • Locate the following registry key:

  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}

  • Click on each registry sub keys

  • Look for the Data column of the DriverDesc value to find out which value corresponds to the WAN Miniport (IP). (For example: 005 in the list)

  • Right-click the sub-key whose DriverDesc value data is WAN Miniport(IP) #2

  • Click Delete

  • Click Yes to confirm

  • Close the Registry editor

  • Navigate to “Device Manager” again

  • Click on the “View” Menu and “Show Hidden devices”

  • Under Network Adapter, locate WAN Miniport(IP) #2 and right click on it

  • Click on Uninstall

  • Click Ok to confirm removal

Steps to re-install TCP/IP protocol:

  • Go to “Control Panel”

  • Click on “Network and Dial-up Connections”

  • Right-click on “Local Area Connection”

  • Click on Install

  • In the Select Network Component Type dialog box, click on Protocol

  • Click on Add

  • Under Network Protocol, click on “Internet Protocol (TCP/IP).”

  • Click on Ok

  • When the Protocol is installed, click Close.

The solutions provided above will generally solve the issue, if the error is caused due to reasons mentioned in the Troubleshooting FAQ. If it doesn’t you need to contact Technical Support of your VPN service provider. Every VPN service provider offers customer support and technical support to resolve any issue related to installation or connection of VPN services.