VPN or Virtual Private Network has become synonymous with Internet security and privacy in recent years. But while setting up the VPN on your machine, it may throw up Error Code – 806 GRE blocked error message. This error message appears when the VPN is misconfigured not to allow the Generic Routing Encapsulation (GRE) protocol packets. Just, follow these easy fixes to solve the problem very quickly.
Fix 1 – Configure port 1723 over the TCP
You have to configure port 1723 over TCP.
Step 1 – Create a new Inbound Rule
1. At first, all you need to do is to press the ‘Windows key+R‘ keys together.
2. Here, write this code and click on “OK“.
firewall.cpl
3. In the Windows Defender Firewall with Advanced Security screen, click on the “Advanced settings“.
4. On the left-hand side, right-click on the “Inbound Rules“.
5. Then, click on the “New Rule…” to create a new inbound rule.
6. Now, select the “Port” from the options.
7. Then, click on “Next“.
8. You will appear in the ‘Protocol and Ports’ section.
9. Then, click on the radio button beside the “TCP“.
10. Then, set the ‘Specific local ports:’ to “1723“.
11. After that, click on “Next” to proceed further.
12. You should be at the ‘Action’ tab.
13. Tick the “Allow the connection” setting.
14. Then, click on “Next” to go to the ‘Profile’ section.
15. When the ‘Profile’ opens up, check the box beside the options “Domain“, “Private” and then “Public” setting.
16. Then, click on “Next” to go to the last step.
17. Finally, set up “PORT RULE FOR VPN” as the name of the rule.
18. Tap on the “Finish” to complete the process.
Step 2 – Create a new Outbound Rule
1. First, right-click on the “Outbound Rule” and click on the “New Rule…“.
2. Now, choose the “Port” in the ‘Rule Type’ section.
3. Then, click on “Next“.
4. Next, tick the option “TCP” in the list.
5. After that, set the ‘Specific local ports:’ to “1723“.
6. Next, click on “Next” to proceed further.
7. After that, check the “Allow the connection” box setting.
8. Then, click on “Next” to go to the ‘Profile’ section.
9. When the ‘Profile’ opens up, check these three “Domain“, “Private” and then “Public” settings.
10. After that, click on “Next” to go to the last step.
11. Finally, set up “NEW OUTBOUND RULE” as the name of the rule.
12. Just, click once on the “Finish“.
This will create a new outbound rule on your computer.
Close the Windows Defender Firewall with the Advanced Security window. Try to set up the VPN settings again.
Fix 2 – Open the GRE port for protocol 47
You have to open the GRE port rule within a new rule in the firewall settings.
1. At first, all you need to do is to press the ‘Windows key+R‘ keys together.
2. Here, write this code and click on “OK“.
firewall.cpl
3. In the Windows Defender Firewall with Advanced Security screen, click on the “Advanced settings“.
4. On the left-hand side, right-click on the “Inbound Rules“.
5. Then, click on the “New Rule…” to create a new inbound rule.
6. Now, on the ‘Rule Type’ in the “Predefined” setting.
7. After that, click on the drop-down and click on the “Routing and remote access“.
8. After that, click on the “Predefined Rules“. on the left-hand pane.
9. Then, check all three options –
Routing and remote access (PPTP-In) Routing and remote access (L2TP-In) Routing and remote access (GRE-In)
10. Go to the “Action” on the left-hand side.
11. Then, check the “Allow the connection” setting.
12. Finally, click on “Finish” to create the new inbound rule.
Close the Windows Defender Firewall screen.
Try to use a VPN on your computer.
Fix 3 – Add an exception
You can add the VPN app to the list of exceptions.
1. At first, all you need to do is to press the ‘Windows key+R‘ keys together.
2. Here, write this code and click on “OK“.
firewall.cpl
3. In the Windows Defender Firewall with Advanced Security screen, click on the “Allow an app or feature through Windows Defender Firewall“.
4. After that, click on the “Change settings“.
5. Then, locate the VPN app from the list.
6. After that, select the VPN app and check the ‘Public’ and ‘Private’ boxes.
7. Click on “OK“.
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NOTE –
If you can’t find the app in the listed application, do this –
1. Just click on the “Allow another app…“.
2. Now, go to the location of the installed VPN on your computer. Select the application and click on “Open“.
Then, follow the steps mentioned before, to allow the app through the Private and Public network.
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After doing this, check the VPN connection.
Extra Tips –
1. Whitelist the VPN app with the third-party antivirus on your computer. Sometimes, the antivirus can block and cut off the connection of the VPN application.
2. You have to allow PPTP passthrough on the router you are using. You can access the PPTP settings from the router configuration website and enable the PPTP protocol from there.
3. Try to upgrade the router firmware from the router configuration page. Check if this solves your problem.