How to fix VPN Error 806 (GRE Blocked) on Windows 11/10

Are you seeing VPN Error 806 when you are trying to use VPN on your Windows 10 PC? What exactly is VPN Error 806 and how can we fix the error and connect to VPN? In this guide, we show you ways to fix VPN Error 806 (GRE Blocked) on Windows 11/10.

VPN has become a necessity these days due to various reasons. First and foremost among them is privacy. There are many VPN service providers available with the most efficient features to provide you with privacy and security. You can use a VPN for free and also get additional features with a paid subscription. Every application we use shows us some errors at some point in time. VPN errors are also common, but they can be fixed easily with some tweaks.

What is VPN Error 806 (GRE Blocked)

For a VPN to work as expected and do whatever it has to do to make your PC secure and private, the program has to connect with your internet connection. When the connection between your internet connection and VPN is blocked or disturbed by any firewall or any other program, then you see VPN Error 806 (GRE Blocked). GRE stands for General Routing Encapsulation. You have to avoid or fix the program that is disturbing the connection between your internet and VPN program.

Generally, whenever you see VPN 806 (GRE Blocked) Error, you see the following message:

There is a connection between your computer and the VPN server, but the VPN connection cannot be established. The error code is 806. The most common reason for 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 GRE (Generic Routing Encapsulation) protocol packets. If the problem persists, contact your network administrator or ISP.

How to fix VPN Error 806 (GRE Blocked)

VPN Error 806 (GRE Blocked) can be fixed by any of the following methods.

Open TCP Port 1723
Turn off Windows Defender Firewall
Turn off Antivirus
Update your router’s firmware

Let’s see the fixes in detail and know how to do them

1] Open TCP Port 1723

VPN by default uses TCP port 1723 by default. It is open by default too. Sometimes, it fails to open. You have to do it manually to fix the error VPN 806 (GRE Blocked).

To open TCP Port 1723,

Go to Windows Defender Firewall Advanced Security
Select Inbound Rules
Click on Action and select New Rule
Select Port, enter 1723 code, and allow connection

If we go into details, search for Firewall in the Start Menu search and open Windows Defender Firewall with Advanced Security.

In the Windows Defender Firewall Advanced Settings, click on Inbound Rules to continue opening the port.

Then, click on Action in the menu and select New Rule.

It will open a New Inbound Rule Wizard. Check the radio button beside Port and click Next at the bottom of the window.

Now, the button beside TCP is checked by default. Enter 1723 in the text box beside Specific local ports and click on Next>.

You have to Allow the connection to open TCP port 1723. Check the button beside it and click on Next>.

Then, enter the Name you wish to name the rule finish opening the TCP port 1723.

2] Temporarily turn off Windows Firewall

Windows Defender Firewall might be causing the VPN error 806. You have to turn off the Windows Firewall to fix the issue. After turning off the Firewall, you can try connecting to VPN.

3] Temporarily turn off Antivirus

We use antivirus to protect our PC from threats that we don’t see or expect. Most of the antivirus programs take over the Firewall settings of your PC and manage them to protect your PC. The antivirus might be working against your VPN connection doing its work in protecting your PC. Turn it off and try connecting to VPN.

4] Update your router’s firmware

VPN connections use the latest protocols to give you a private connection. When the protocols of your VPN and your router are not matched, the connection cannot be established. You have to update the router’s firmware to get the latest protocols.

These are the possible fixes that can resolve the VPN Error 806 (GRE Blocked) on your Windows 10. If you have any doubts or suggestions do let us know, through the comments.