Fix any VPN error on Windows 10 in just a couple of steps


Milan Stanojevic
by Milan Stanojevic
Deputy Editor
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VPN errors on Windows 10

Many users are concerned about their online privacy, and in order to protect it, they tend to use VPN tools.

VPN software can be great, but sometimes you can encounter errors with your VPN program, and today we’re going to show you how to fix VPN errors on Windows 10.

How can I fix VPN errors on Windows 10?

Fix: general VPN errors on Windows 10

1. Make changes to your registry

Users reported Failed to initialize connection subsystem error on their PC while trying to use Cisco VPN software, but you can easily fix this problem simply by adding one value to your registry.

Before we start changing the registry, we have to warn you that modifying the registry can lead to all sorts of problems, therefore it’s recommended that you create a backup of your registry before you continue.

To fix this problem, you need to do the following:

  1. Press Windows Key + R and enter regedit. Press Enter or click OK.
    vpn-error-regedit-1
  2. When Registry Editor opens, go to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings key in the left panel.
  3. Right click Internet Settings key and choose New > Key from the menu.
    vpn-error-regedit-2
  4. Enter GlobalUserOffline as the name of the new key and select it.
  5. In the right pane, double click the (Default) DWORD to open its properties.
  6. Enter 1 in the Value data field and click OK to save changes.
    vpn-error-regedit-3
  7. After doing that, close Registry Editor and check if the Cisco software is working properly.

If you can’t edit your Windows 10’s registry, read this handy guide and find the quickest solutions to the issue.


2. Run Cisco AnyConnect in Compatibility mode

Compatibility mode is a great feature that allows you to run older software on Windows 10 without any problems. To do that, you need to follow these simple steps:

  1. Locate Cisco AnyConnect shortcut, right click it and choose Properties.
  2. Go to Compatibility tab.
  3. Check Run this program in compatibility mode for and select any older version of Windows.
    vpn-error-compatibility-1
  4. Click Apply and OK to fix the problem.

After turning on compatibility mode the issue with Cisco AnyConnect should be resolved. Few users reported that this issue can also be solved by running the setup file in compatibility mode, so you might want to try that as well.


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3. Delete the WAN Miniport (IP), WAN Miniport (IPv6) and WAN Miniport (PPTP) devices

Certain devices, such as WAN Miniport, can interfere with built-in Windows VPN feature and cause all sorts of problems to appear.

Users reported A Connection to the remote computer could not be established error while trying to use VPN on Windows 10, and one of the suggested solutions is to delete all WAN Miniport devices.

To do that, follow these steps:

  1. Press Windows Key + X to open Win + X menu. Choose Device Manager from the list.
    vpn-error-device-1
  2. When Device Manager opens, go to View > Show hidden devices.
    vpn-error-device-2
  3. Locate all WAN Miniport devices and delete them.
  4. After deleting all Miniport devices your VPN connection should start working without any problems.

4. Install Cisco VPN tool properly

Users reported that they are getting Cisco VPN error 27850 during the installation, and one way to fix this problem is to properly install the tool. To do that, follow these steps:

  1. Download the latest Cisco VPN software. Don’t run the setup file yet.
  2. Download DNE software from Cisco and install it. Make sure to download 32-bit or 64-bit version so it matches your operating system.
  3. Install the DNE software.
  4. After that, install Cisco VPN.

Users also reported error 442 which means that Virtual Adapter couldn’t be enabled. To fix this problem, simply open the Registry Editor and follow these steps:

  1. Go to the HKLM\SYSTEM\CurrentControlSet\Services\CVirtA key in the left panel.
  2. Double click the DisplayName string in the right panel and change its value to Cisco Systems VPN Adapter for 64-bit Windows.
  3. Close Registry Editor and check if the problem is resolved.

Can’t access the Registry Editor? Things aren’t as scary as they seem. Check out this guide and solve the issue quickly.


5. Use Microsoft CHAP Version 2

You can fix some errors with your VPN simply by allowing certain protocols. Users reported that they fixed the problem with VPN connection by following these steps:

  1. Locate your VPN connection, right click it and choose Properties from the menu.
  2. When Properties window opens, go to Security tab, select Allow these protocols and check Microsoft CHAP Version 2 (MS-CHAP v2).

After enabling Microsoft CHAP Version 2, your VPN should start working without any problems.


6. Diagnose and disable your connection

One way to fix problems with VPN is to diagnose your connection. By diagnosing your connection Windows 10 will fix some of the common VPN errors. To do that, follow these steps:

  1. Press Windows Key + X and select Network Connections from the menu.
  2. When Network Connections window opens locate your VPN connection, right-click it and choose Diagnose from the menu.
    vpn-error-network-1
  3. Wait for the scan to finish.
  4. If the problem still persists, right-click the VPN connection and choose Disable.
    vpn-error-network-2
  5. Wait for a few seconds and enable your VPN connection by following the same steps.

This is a simple solution and few users reported that it worked for them, so you might want to try it out.


7. Uninstall Citrix DNE Updater

If you’re using Cisco’s IPSEC VPN client, you can fix many errors simply by uninstalling Citrix DNE Updater.

After uninstalling this tool, download and install SonicWall VPN 64-bit Client from Dell. After doing that, the issue with VPN should be completely resolved.


Want to completely remove an app from your PC? Use on of these amazing uninstallers for Windows 10.


8. Make changes to the registry before installing Cisco VPN

Sometimes you can fix Error 27850 while installing Cisco VPN simply by making one small change to your registry. Before installing Cisco VPN, open Registry Editor and follow these simple steps:

  1. When Registry Editor opens, in the left pane navigate to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network key in the left panel.
  2. In the right panel, locate MaxNumFilters and double click it. Change the Value data from 8 to 14 and save changes.
  3. Close Registry Editor and restart your PC.

After changing this value in Registry Editor, you should be able to install Cisco VPN without any errors.


9. Restart LogMeIn Hamachi tunneling engine service

If you’re using LogMeIn as your VPN tool, you might encounter certain problems with it. The simplest way to fix most LogMeIn errors is to restart the LogMeIn Hamachi Tunneling Engine service.

This is a simple process and in order to do it you need to follow these steps:

  1. Press Windows Key + R and enter services.msc. Click OK or press Enter.
    vpn-error-services-1
  2. When Services window opens, locate LogMeIn Hamachi Tunnelling Engine service and double click it.
  3. If the service is running, click the Stop button.
  4. Wait for few seconds and click the Start button to start it again.

After restarting the LogMeIn service, check if the VPN error is resolved.


10. Check if your clock is correct

Users reported Error Code 1 while using SoftEther VPN client, and one of the fastest ways to fix this problem is to check your time and date. You can easily do that by following these steps:

  1. In the bottom right corner right click your clock and choose Adjust date/time.
    vpn-error-clock-1
  2. Check if your clock is correct. If it’s not, disable Set time automatically option and turn it back on.
    vpn-error-clock-2

After doing that, your clock should be correct and the VPN error will be resolved.


Your PC’s clock falls behind? Check out this simple guide and fix it in no time.


11. Enable Allow service to interact with the desktop option

If you’re having Cisco VPN Client Driver error, you should be able to solve it by enabling one option. To do that, follow these steps:

  1. Open Services window.
  2. Locate Cisco AnyConnect Secure Mobility Agent and double-click it.
  3. Navigate to the Log On tab and check the Allow service to interact with the desktop option.
    vpn-error-log-on-1

12. Use Command Prompt

Another way to fix Cisco VPN Client Driver error is to use Command Prompt. To do that, follow these steps:

  1. Press Windows Key + X and select Command Prompt (Admin).
    vpn-error-cmd-admin-1
  2. When Command Prompt opens, enter the following commands:
    • net stop CryptSvc
    • esentutl /p %systemroot%\System32\catroot2\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\catdb
  3. When asked, be sure to select OK to attempt the repair.
  4. After the repair process is finished, exit Command Prompt and restart your PC.

If you’re having trouble accessing Command Prompt as an admin, then you better take a closer look at this guide.


13. Configure Hamachi properly

Problems with LogMeIn VPN can occur if you don’t configure it properly, but fortunately you can fix this error by following these steps:

  1. Open Hamachi and write down your Hamachi IP address.
  2. Open Network Connections window.
  3. Locate your Hamachi adapter, right click it and choose Properties.
  4. Select Internet Protocol (TCP/IP) and click the Properties button.
    vpn-error-internet-protocol-1
  5. In General tab make sure that Obtain an IP address automatically and Obtain DNS server address automatically options are selected.
  6. Go to Alternate Configuration tab.
  7. Select User configured option.
  8. In the IP address field enter the Hamachi IP address that you got in Step 1.
  9. Enter 255.0.0.0 as the Subnet mask and 5.0.0.0 as Default Gateway.
    vpn-error-internet-protocol-2
  10. Click OK to save changes and restart your PC.

You’re unable to change the IP and DNS on your Windows 10 PC? Don’t worry, we’ve got you covered.


14. Stop AviraPhantomVPN service

If you’re using Avira Phantom VPN, you should be able to fix some of its problems simply by restarting the AviraPhantomVPN service. You can quickly do that by following these steps:

  1. Open Command Prompt as administrator.
  2. When Command Prompt opens, enter the following lines:
    • net stop AviraPhantomVPN
    • net start AviraPhantomVPN
  3. After that, try to start Avira Phantom VPN again.

15. Reinstall your VPN software (suggested)

If you’re using a third-party VPN software, you might be able to fix its errors simply by reinstalling it. Users reported that they fixed many problems with Avira VPN simply by performing a reinstall, so be sure to try that.

Keep in mind that this solution applies for all third-party VPN tools.


Fix – VPN error 807 Windows 10

1. Disable IPv6

There are two types of IP addresses: IPv4 and IPv6. According to some users, IPv6 can cause VPN error 807 to appear. One way to fix this problem is to disable IPv6 by following these steps:

  1. Open Registry Editor.
  2. When Registry Editor opens, navigate to the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters key in the left panel.
  3. In the right panel, look for DisabledComponents DWORD. If this DWORD isn’t available, create it by clicking the empty space and choosing New > DWORD (32-bit) Value. Enter DisabledComponents as the name of the new DWORD.
    vpn-error-new-dword-1
  4. Double click the DisabledComponents DWORD and enter FFFFFFFF as Value data.
    vpn-error-new-dword-2
  5. Click OK to save changes.
  6. Close Registry Editor and restart your PC.

After disabling IPv6 completely, VPN error 807 should be fixed.


2. Use flushdns command

Users reported that they fixed the VPN error 807 simply by running ipconfig /flushdns command in Command Prompt. To do that, follow these simple steps:

  1. Open Command Prompt as administrator.
  2. When Command Prompt opens, enter ipconfig /flushdns and press Enter to run it.
  3. After the command is executed, close Command Prompt and check if the problem is resolved.

3. Disable the wireless connection

Few users reported that they fixed error 807 simply by disabling the wireless connection. For some unknown reason, the wireless connection would interfere with VPN and cause this error to appear.

One way to fix this error is to turn off your wireless connection completely. Users reported that they solved the problem by disabling the wireless connection on their router completely, so you might want to try that.


Having wireless adapter or access point issues on Windows 10? Fix them by following this guide.


4. Change VPN connection properties

Few users reported that they fixed the problem simply by changing their VPN connection properties. To do that follow these steps:

  1. Open Network Connections window.
  2. Locate your VPN connection. Right click it and choose Properties.
  3. Navigate to Security tab.
  4. Set the Type of VPN to Automatic.

Users reported that their Type of VPN was set to PPTP, but after setting it to Automatic, the issue was completely resolved.


5. Edit your hosts file

Users reported that they fixed error 807 after editing the hosts file. According to users, they were trying to access the VPN server by using the server’s IP address, and that was causing this error to appear.

You can fix this problem by opening the hosts files and assigning a name to the VPN’s server address. To do that, follow these steps:

  1. Press Windows Key + S, enter notepad, right click it and choose Run as administrator.
    vpn-error-notepad-1
  2. Choose File > Open.
  3. Go to C:\Windows\System32\drivers\etc folder. Change Text Documents to All files in the bottom right corner and select the hosts file.
    vpn-error-notepad-2
  4. When the hosts file opens, at the end of the file add your VPN’s server IP address and the address that you want to use.
  5. Save changes to the hosts file and try accessing the VPN by using the assigned name.

If you don’t like Notepad, you can try one of these awesome alternatives from this article.


Can’t edit hosts files on Windows 10? Check out this step-by-step guide to solve the issue in no time.


6. Check your VPN configuration

This error can occur if your VPN configuration isn’t correct, and you should be able to fix this problem by making the proper adjustments.

Users reported that they fixed this problem by removing http:// from the beginning of server address.

In addition, you can also remove / at the end of the server address. Users also suggested to change the connection type to Point to Point Tunneling Protocol in the Security tab.


Want to know how to properly create a VPN connection on Windows 10? Find out more in this article.


7. Check your firewall and antivirus

This error can occur due to your firewall settings, and many users are suggesting to enable GRE protocol 47 and open port 1723 in firewall configuration.

After doing that, your VPN connection should work without any problems. In addition to your firewall, you might want to temporarily disable your antivirus software while you’re configuring the VPN connection.


An antivirus is blocking your VPN? Don’t let that ruin your day. Follow this guide and fix it quickly.


Fix – VPN error 619 Windows 10

Change your router startup commands

According to users, it seems that DD-WRT isn’t forwarding GRE PPTP packets, and that can sometimes cause error 619 to appear.

To fix this problem, you need to open your router configuration, navigate to Administration > Commands and add the following commands:

  • /sbin/insmod xt_connmark
  • /sbin/insmod xt_mark
  • /sbin/insmod nf_conntrack_proto_gre
  • /sbin/insmod nf_conntrack_pptp
  • /sbin/insmod nf_nat_proto_gre
  • /sbin/insmod nf_nat_pptp

Bear in mind that this is an advanced solution, therefore be extra cautions while performing it.


Accessing your router’s configuration seems scary? Use on of these router configuration software.


Fix – VPN error 812 Windows 10

1. Change your DNS settings

According to users, you should be able to fix error 812 simply by changing the DNS settings. To do that, follow these steps:

  1. Open Network Connections, locate your VPN connection and open its properties.
  2. Select Internet Protocol (TCP/IP) and click the Properties button.
  3. Check the Use the following DNS server address option and change the Primary DNS to domain controller address and the Alternate DNS server to an external server, for example 8.8.8.8.
  4. Save changes and check if the problem is resolved.

If you have any DNS issues on Windows 10, you can easily fix them by following the simple steps from this guide.


2. Check your username

Users reported this issue while creating a VPN server, and the cause for this problem was the user name. According to users, they used their Microsoft account username while creating a server, but that caused error 812 to appear.

To fix this problem you need to enter your username in the following format: Domain nameusername. After doing that, the issue should be resolved.


3. Add users to the Windows SBS Virtual Private Network Users group

According to users, VPN error 812 can occur if your users aren’t in the proper group. To fix this problem, just add users to the Windows SBS Virtual Private Network Users group and the problem should be resolved.


Fix – VPN error 720 Windows 10

1. Check the DHCP server address

Sometimes this error can occur if the DHCP server address isn’t correct. To fix this problem, you need to do the following:

  1. On the VPN server go to Administrative Tools and select Routing and Remote Access.
  2. Select DHCP Relay Agent and check the DHCP server IP address.

Some users are also suggesting not to use DHCP at all. Instead of using DHCP, they are suggesting to specify the IP range manually on the RAS server.


DHCP server keeps stopping? Don’t worry, we’ve got the right solution for you.


2. Change the user account properties

According to users, you can fix VPN error 720 by opening the Active Directory, opening user’s account properties and checking the Control access through NPS Network Policy option.


3. Delete the Miniports and your VPN connection

Miniports can be the cause for this problem, therefore we suggest that you delete them all. We already explained how to do this in one of our previous solutions, so be sure to check it out.

In addition to deleting Miniports, you can also try deleting your VPN connection and recreating it again.


4. Set the range of IP addresses

One way to fix this problem is to set the range of IP addresses.

Users reported that there was a problem with assigning the IP addresses to the VPN users, and one way to fix this problem was to set the IP address range that matches the IP address range assigned by your router.

To do that, follow these steps:

  1. Locate your VPN connection in the Network Connections window, right-click it and choose Properties.
  2. Select Internet Protocol Version 4 (TCP/IPv4) and click Properties.
  3. Click Specify IP addresses and change the IP range so that it matches the range defined by your router.
  4. Click OK and check if the problem was resolved.

Fix – VPN error 721 Windows 10

1. Change the router settings

According to users, you can fix error 721 by changing your router settings. Users reported that they fixed this error by enabling PPTP passthrough option, so you might want to try that.

Another potential solution might be to change the LAN-to-LAN to L2TP over IPSEC. After that, turn off PPTP as the endpoint on the router and the problem should be fixed.


2. Update router firmware

If you want to fix error 721, one suggested solution is to update your router firmware.

This is an advanced process and in order to avoid causing any damage to your router, we strongly suggest that you check your router manual for detailed instructions.

Download TweakBit’s Driver Updater Tool (approved by Microsoft and Norton) to do it automatically and safely. Disclaimer: some features are not free.


If you need more info on how to update your router’s firmware, check out this dedicated guide.


3. Replace your router

Few users reported that this problem couldn’t be resolved, and the only solution was to replace the router.

It seems that certain ISPs and routers can’t fully support certain VPN settings, therefore, you might want to consider replacing your router.


Fix – VPN error 412 Windows 10

1. Don’t use Run as administrator option

According to users, 412 error can occur if you’re using Cisco VPN software. To fix this problem, you have to disable Run as Administrator option.

After that, save changes and check if the problem is resolved.


2. Change your router configuration

Users reported that they managed to fix this problem on their Linksys router simply by adding a few lines to the pcf file. To do that, simply add UseLegacyIKEPort=1 line to the pcf file and save the changes.


3. Check your firewall settings

This error can be caused by your firewall settings, but you should be able to fix it by unblocking certain ports. According to users, port 500, port 4500 and ESP protocol need to be enabled.

In addition, enable NAT-T/TCP protocol and open port 10000. If you’re using a Cisco VPN client, enable UDP ports 500 and 62515 ports.


You want to check if your firewall is blocking some ports? Follow the simple steps from this guide to find out.


Fix – VPN error 691 Windows 10

1. Change your username

Error 691 can occur if your username isn’t correct, therefore be sure to enter your username in the Username@DomainName format. After doing that, the issue with error VPN error 691 should be resolved.


2. Change LAN Manager authentication level

You can fix this problem, simply by making changes in the Local Security Policy tool. To do that, follow these steps:

  1. Press Windows Key + S and enter local security policy. Select Local Security Policy from the menu.
    vpn-error-local-security-1
  2. In the left pane, navigate to the Local Policies > Security Options.
  3. In the right pane, double click the LAN Manager authentication level.
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  4. From the menu select Send LM & NTLM responses. Click Apply and OK to save changes.
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  5. Locate Minimum Minimum session security for NTLM SSP option and double click it.
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  6. Disable Require 128-bit encryption and click Apply and OK.
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  7. Restart your PC and check if the problem was resolved.

3. Disable CHAP security protocol

Sometimes this error can appear if both CHAP and MS-CHAPv2 are enabled, but you can easily fix this problem. To do that, simply disable CHAP and the error 691 will be fixed completely.

VPN is useful if you want to protect your privacy online, but many errors with VPN can occur. If you experience any VPN errors be sure to check some of our solutions.

IF you have any other questions or suggestions, don’t hesitate to leave them in the comments section below.

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