How to fix 806 (error VPN GRE blocked) in Windows 10

By: Matthew Adams
3 minute read

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VPN error 806 is one that pops up for some VPN users within an ‘Error Connecting to VPN Connection‘ window. When that error window opens, their VPNs don’t work for them. The full VPN error 806 error message is a lengthy one that states:

A connection between your computer and the VPN server has been established but the VPN connection cannot be completed. Error Code 806 – The most common cause for this failure is that at least one Internet device (for example, a firewall or router) between your computer and the VPN server is not configured to allow Generic Routing Encapsulation (GRE) protocol packets. If the problem persists, contact your network administrator or Internet Service Provider.

How to fix VPN error 806

  1. Open the TCP Port 1723
  2. Open Protocol 47 (GRE)
  3. Switch Off Anti-virus Software
  4. Turn Off the Windows Firewall
  5. Select Your Router’s PPTP Setting

1. Open the TCP Port 1723

The 806 error message does provide some insight on the issue by stating that a firewall or router probably needs to be configured for the GRE protocol. So one of the best resolutions for it is to open TCP Port 1723. This is how you can open TCP Port 1723 in Windows 10.

  • Press the Cortana button on the taskbar to open that app’s search box.
  • Input the keyword ‘firewall’ in the search box, and select to open the Windows Defender Firewall with Advanced Security window shown directly below.

  • Click Inbound Rules on the left of that window.
  • Click Action and select the New Rule option to open the window in the image below.

  • Select the Port option, and press the Next button.

  • Then select the TCP option if it’s not already selected.
  • Enter ‘1723’ in the Specific local ports text box.

  • Click Next and select the Allow the connection option.

  • Press the Next button, and select all three of the check boxes shown in the snapshot directly below.

  • Click Next to move to the final step. There you can enter anything in the text boxes, and press the Finish button.

— RELATED: Fix: VPN error on Windows 10

2. Open Protocol 47 (GRE)

  • In addition to opening port 1723, open protocol 47 (otherwise the GRE protocol type). To do that, open the Windows Defender Firewall and Advanced Security window again.
  • Right-click Inbound Rules and select the New Rule option.
  • Select the Custom option.
  • Then click Protocol and Ports on the left of the window to open the options directly below.

  • Select GRE from the Protocol type drop-down menu.
  • Then click Name and press the Finish button to close the wizard’s window.

3. Switch Off Anti-virus Software

Some VPN errors can be due to antivirus software. As such, switching third-party anti-virus utilities off might resolve VPN error 806. You can usually do that by right-clicking their system tray icons and selecting a disable option. If you can’t switch off an anti-virus utility via its context menu, open its window and select a disable option from there.

— RELATED: FULL FIX: Avira Phantom VPN failed to connect to the service

4. Turn Off the Windows Firewall

Windows Firewall can also block VPN software. So switch the Windows Firewall off just before connecting to VPN. You can switch off the Windows Firewall as follows.

  • Open the Cortana app.
  • Enter the keyword ‘Windows Firewall’ in the search box, and select to open Windows Defender Firewall.
  • Click Turn Windows Defender Firewall on or off to open the settings shown directly below.

  • Select both the Turn off Windows Defender Firewall options, and press the OK button.

5. Select Your Router’s PPTP Setting

Also make sure that your router’s PPTP setting is enabled. That’s a network protocol which is still utilized for many VPNs. How you select that setting varies with alternative router models. However, you can usually select a PPTP option via the router’s firmware. You can check out this post for further details about opening router software in your browser.

Those resolutions might fix the VPN error 806 so that you can connect to VPN. Some of the general VPN fixes in this article might also come in handy for resolving VPN error 806 in Windows 10.


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