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?

1. General guide to fix VPN errors

1.1. Make changes to your registry Users reported the 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. If you can’t edit your Windows 10’s registry, read this handy guide dedicated to fixing regedit and find the quickest solutions to the issue. 1.2. 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 steps above. Few users reported that this Cisco AnyConnect issue can also be solved by running the setup file in compatibility mode, so you might want to try that as well. 1.3. Delete the WAN Miniport (IP), WAN Miniport (IPv6) and WAN Miniport (PPTP) device Certain devices, such as WAN Miniport, can interfere with the 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. 1.4. Install Cisco VPN tool properly Others reported that they are getting the Cisco VPN error 27850 during the installation, and one way to fix this problem is to properly install the tool. Users also reported the error 442 which means that the Virtual Adapter couldn’t be enabled. To fix this problem, simply open the Registry Editor and follow these steps: Can’t access the Registry Editor? Things aren’t as scary as they seem. Check out this guide about accessing the Regedit and solve the issue quickly. 1.5. 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 the VPN connection by following the steps. 1.6. 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. This is a simple solution and few users reported that it worked for them, so you might want to try it out. 1.7. Uninstall Citrix DNE Updater If you’re using the 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 the VPN should be completely resolved. 1.8. Make changes to the registry before installing Cisco VPN Sometimes you can fix the Error 27850 while installing Cisco VPN simply by making one small change to your registry. Before installing Cisco VPN, open Registry Editor and follow the steps above. After changing this value in the Registry Editor, you should be able to install Cisco VPN without any errors. 1.9. 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. 1.10. 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: After doing that, your clock should be correct and the VPN error will be resolved. 1.11. Enable Allow service to interact with the desktop option If you’re having a Cisco VPN Client Driver error, you should be able to solve it by enabling one option. 1.12. Use Command Prompt Another way to fix Cisco VPN Client Driver error is to use Command Prompt. If you’re having trouble accessing Command Prompt as an admin, take a look at this guide dedicated to using CMD with admin rights. 1.13. 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 aforementioned steps. 1.14. 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. 1.15. Reinstall your VPN software (suggested) If you’re using third-party VPN software, you might be able to fix its errors simply by performing a reinstall, so be sure to try that. Keep in mind that this solution applies to all third-party VPN tools.

2. VPN error 807 Windows 10

2.1. 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: 2.2. Use flushdns command Users reported that they fixed the VPN error 807 simply by running the ipconfig /flushdns command in Command Prompt. To do that, follow these simple steps: 2.3. 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 the 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. 2.4. Change VPN connection properties Few users reported that they fixed the problem simply by changing their VPN connection properties. The type of VPN was set to PPTP, but after setting it to Automatic, the issue was completely resolved. 2.5. Edit your hosts file Users reported that they fixed error 807 after editing the host’s 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. 2.6. 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 dedicated article. 2.7. 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 the 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.

3. VPN error 619 Windows 10

Change your router startup commands It seems that DD-WRT isn’t forwarding GRE PPTP packets, and that can sometimes cause error 619 to appear. Bear in mind that this is an advanced solution, therefore be extra cautious while performing it. Check this article dedicated to accessing your router’s configuration to learn more.

4. VPN error 812 Windows 10

4.1. Change your DNS settings According to users, you should be able to fix error 812 simply by changing the DNS settings. Take a closer look at this useful guide dedicated to fixing DNS issues to learn more about it. 4.2. 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. 4.3. 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.

5. VPN error 720 Windows 10

5.1. 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: Some users are also suggesting not to use DHCP at all. Instead of using DHCP, they are suggesting specifying the IP range manually on the RAS server. 5.2. Change the user account properties According to users, you can fix the VPN error 720 by opening the Active Directory, opening user’s account properties and checking the Control access through NPS Network Policy option. 5.3. 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. 5.4. Set the range of IP addresses If there is a problem with assigning the IP addresses to the VPN users, one way to fix this problem was to set the IP address range that matches the IP address range assigned by your router.

6. VPN error 721 Windows 10

6.1. 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. 6.2. 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. If you need more useful info about the subject, take a closer look at this article dedicated to updating your firmware. 6.3. 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.

7. VPN error 412 Windows 10

7.1. 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. 7.2. 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. 7.3. 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. Follow this simple guide about checking blocked firewall ports to learn more.

8. VPN error 691 Windows 10

8.1. Change your username Error 691 can occur if your username isn’t correct, therefore be sure to enter your username in the [email protected] format. After doing that, the issue with error VPN error 691 should be resolved. 8.2. Change LAN Manager authentication level 8.3. 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, suggestions, or experience with some of our methods, don’t hesitate to leave them in the comments section below.

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