How to troubleshoot VPN error 806 (GRE blocked) in Windows

Sometimes, you just can’t connect to the VPN. No matter what you do, your Windows 10 can’t establish a connection to the VPN server. You might get error 806. Don’t fret. We’re going to help you troubleshoot VPN error 806. The easiest way to troubleshoot VPN error 806 in Windows 10 is to use the Network and Sharing Center, which is a control panel applet that helps you diagnose and fix networking issues. Given that there are dozens of things that can go wrong before Windows can’t connect to the VPN, you should always start with the basic stuff. You might not be able to resolve error 806, but you should at least

Sometimes, you may connect to the Internet using a VPN to browse more securely, access restricted websites, or unblock geo-blocked sites. But what if your VPN keeps disconnecting, and you get error 806 (GRE blocked) in Windows?  In this article, we’ll explain what error 806 is, and how to troubleshoot it.

One of the guide client connection servers is currently unreachable. Please check your Internet connection and try again. If the problem continues, contact your network administrator or Internet service provider.

word-image-3768 RECOMMENDED: Click here to fix Windows errors and optimize system performance. When working with a VPN, errors sometimes occur in certain circumstances, especially on Windows 10, one of them is called 806 (VPN GRE error blocked). If you see a pop-up window, the VPN is not working. The full context of the message is as follows: A connection has been established between your computer and the VPN server, but the VPN connection cannot be completed. Error Code 806 – The most common cause of this error is that at least one Internet device (such as a firewall or router) between your computer and the VPN server is not configured to allow Generic Routing Encapsulation (GRE) packets. If the problem persists, contact your network administrator or Internet service provider.

What causes VPN error 806 (GRE blocked) in Windows?

word-image-9175 It turns out that this behavior can be caused by several reasons. The following is a list of possible causes of VPN error 806 (GRE Blocked): Outdated router firmware : One of the most common causes of this problem is an outdated firmware version that prevents the router from handling the GRE protocol. To avoid this, you can update your router’s firmware to the latest version through official channels. TCP port 1723 is closed: This TCP port is used by most VPN clients to bypass firewall connections. If the error message is due to this port being closed, you can solve the problem by whitelisting this port in your firewall settings. Various firewall problems: If this problem only occurs when the firewall is active, you can temporarily disable the third-party package for the duration of the VPN. Now that you know all the possible culprits, here’s a short list of methods that other affected users have successfully used to fix the VPN error.

Fix VPN error 806 (GRE blocked) on Windows

May 2021 update:

We now recommend that you use this tool to fix the error. Moreover, this utility repairs common computer errors, protects you from file loss, malware and hardware malfunctions, and optimizes your PC for maximum performance. With this program you can quickly solve PC problems and prevent further problems:

  • Step 1: Download the PC recovery and optimization tool (Windows 10, 8, 7, XP, Vista – Microsoft Gold Certified).
  • Step Two: Click Start Scan to detect problems in the Windows registry that may be causing problems with your PC.
  • Step Three: Click Repair All to fix all issues.

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Open GRE port for protocol 47

  1. Follow the steps in the previous solution and create a new incoming rule in the advanced firewall settings.
  2. Define rule type as predefined
  3. Define pre-defined settings for routing and remote access
  4. In the Predefined Rules section, select all the rules for Routing and Remote Access.
  5. In the Action section, select Allow connection and click Finish.
  6. Create a new exit line by following the same steps

Use a reliable VPN service

When you manually configure a VPN connection in Windows 10, errors such as 806 sometimes occur. To avoid this problem in the long run, we recommend you to choose a commercial and reliable VPN service. This will automatically establish a secure tunnel when you connect to the VPN server. You can even configure your computer to accept incoming VPN connections by requesting port forwarding, without having to change your router settings.

Adding a firewall exception

  1. Go to Firewall and Network Security
  2. Click on Allow application through firewall
  3. Click on Edit Settings (you must have administrator rights)
  4. Find your VPN application in this list and check the appropriate boxes for Private and Public.
  5. If you can’t find your VPN application here, click Allow another application to find and add it.

If your firewall didn’t whitelist the VPN when you created the secure tunnel, this may explain why you keep seeing the VPN 806 error on Windows 10.

Open port 1723 via TCP

  1. Click on the Start button, type Firewall and select Firewall and Network Security.
  2. Click on Advanced Settings
  3. Click Yes when prompted by User Account Control (UAC).
  4. Choose Incoming Lines.
  5. Open the Action menu and choose New Rule.
  6. Define the control port type
  7. In the Protocol and Ports section, select TCP and set the Locally Specific Ports option to 1723.
  8. Set the action to allow the connection
  9. Under Profile, select Domain, Private and Public.
  10. Enter a name and click Done.
  11. Go to Outgoing message rules and repeat the following steps

Whitelist the VPN application with your antivirus

If you do not use third-party antivirus software, Windows Defender is responsible for your firewall settings. If you have already added an exception for your VPN application through Windows Firewall, you do not need to perform this step. Otherwise, run your anti-malware solution and make sure your VPN application is on the white list. This will prevent your antivirus software from blocking the VPN. RECOMMENDED: Click here to fix Windows errors and optimize system performance.

frequently asked questions

This error indicates that the router’s firewall is preventing certain VPN protocol traffic between the client and the server. In most cases, these are TCP ports 1723 and 47 (GRE), which must be opened by the responsible network administrator. Log into the firewall and click on Firewall -> Service. Click the ADD button at the bottom of the page. Select GRE (47) from the log drop-down list and press OK. (Port 1723 is already configured as PPTP on the SonicWall).

  1. Navigate to TCP port 1723 and open it.
  2. Another way to solve the GRE VPN blocking problem is to disable the Windows antivirus software and firewall on your computer.
  3. Open Records 47 (GRE).
  4. Make sure the PPTP setting on your router is enabled.

You use the pptpsrv.exe and pptpclnt.exe files from the Microsoft Windows utility support package. To use these command lines, run the command line, type pptpsrv on the VPN server and pptpclnt server name or IP on the VPN client. word-image-9177This article is to help you troubleshoot and fix error 806 in your Windows operating system. Error 806 is a common error when installing a VPN connection. If you have error 807 or error 800, you can follow the instructions on this page and use the same steps.. Read more about pptp vpn troubleshooting and let us know what you think.

Frequently Asked Questions

How do I allow GRE protocol for VPN connection?

Most VPN connections require that you allow the GRE protocol for VPN connections. This is because the VPN tunnel uses GRE protocol to communicate between your computer and VPN server. If you happen to come across error 806 while setting up or utilizing a VPN connection you will need to click the checkbox next to “Allow these protocols” to allow GRE protocol for VPN connections. If you are planning to use a VPN for security or to bypass internet restrictions, you may find that it does not work. In some cases, you may get an error message or error code 806. This may occur with or without a proxy server. The error message is “The remote computer does not have a program installed that is required to view this media.”

How do I enable GRE protocol?

If you are using a VPN service with your Windows PC and suddenly encounter error 806 (GRE blocked), don’t panic. This is a widely experienced issue that is caused by the inability of the system to use the GRE protocol. (In most cases, this is a result of your PC not having the right network driver.) The good news is that there is a way to quickly resolve this issue and get back online. The IPsec/IKE/L2TP/PPTP/GRE protocols are all used by Windows to create a VPN. However, the GRE (generic routing encapsulation) protocol isn’t always necessary, and sometimes the Windows OS will try to use GRE instead of IKE and it will fail. If this error occurs, check your VPN settings and see if you’re trying to use GRE. If so, change the type of VPN protocol you’re using in Windows to IKE, and your VPN connection should work again.

Can’t connect to PPTP VPN Windows 10?

Remote Desktop and VPN connections are both useful tools for accessing your work computer from home or accessing resources from home on your work computer. They both have their advantages and disadvantages, but both can be useful. A VPN connection is a good way to (potentially) circumvent blocked or censored websites and services, and Remote Desktop is a great way to access your computer from a different computer or keep working even while traveling. If you are having trouble connecting to your VPN or Remote Desktop, here are a few steps that you can try to solve the problem. A huge reason why people love the Windows 10 operating system is because of the VPN feature. This is a feature that allows the user to connect to the internet through a Virtual Private Network. A VPN is basically a method of protecting your network by making it look like you are connected to the network from somewhere else. This is very useful for people who love to play online games that are geo-restricted. A VPN will allow you to connect to a server in the region that you want to play in.

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