List of Common VPN Error Codes

In today’s interconnected world, Virtual Private Networks (VPNs) have become an essential tool for ensuring online security, privacy, and access to geo-restricted content. However, like any technology, VPNs can sometimes encounter errors that disrupt your connection.

In this article, we’ll explore a list of common VPN error codes and their possible causes and solutions.

1. VPN Error 51
2. VPN Error 412
3. VPN Error 619
4. VPN Error 628
5. VPN Error 691
6. VPN Error 720
7. VPN Error 721
8. VPN Error 734
9. VPN Error 789
10. VPN Error 798
11. VPN Error 800
12. VPN Error 806
13. VPN Error 807
14. VPN Error 809
15. VPN Errors 812, 732, 734

1. VPN Error 51 – “Unable to communicate with the VPN subsystem”

Error 51 is typically reported by VPN clients with the message “Unable to communicate with the VPN subsystem.” This error arises when the local VPN service is not running or when the client is not connected to a network. The most common solution is to restart the VPN, which often resolves the issue.

2. VPN Error 412 – “The remote peer is no longer responding”

Error 412 is triggered by network failures or firewall blocking ports, and it displays the message “The remote peer is no longer responding.” This error can be resolved by checking your network connection or configuring your firewall to allow VPN traffic.

3. VPN Error 619 – “A connection to the remote computer could not be established”

When you encounter Error 619, you may see the message “A connection to the remote computer could not be established.” Firewalls often prevent VPN clients from making secure connections to servers. This error is more frequent when using PPTP on networks where it’s blocked.

4. VPN Error 628 – “Connection was terminated by the remote computer”

Error 628 indicates that the connection was terminated by the remote computer before it could be completed. This often happens due to firewall or network problems or conflicts. Check your firewall settings and network conditions to resolve this issue.

5. VPN Error 691 – “User name and password combination not recognized”

Error 691 may occur for two reasons: the user name and password combination provided is not recognized, or the selected authentication protocol is not permitted on the remote access server. Double-check your credentials and the server’s settings.

6. VPN Error 720 – “No PPP control protocols configured”

This error is typically received when using PPTP or L2TP protocols, displaying the message “No PPP control protocols configured.” It occurs when the client lacks the necessary protocol support to communicate with the server. Configure the correct protocol in your Windows Control Panel to resolve this issue.

7. VPN Error 721 – “The remote computer did not respond”

Error 721 occurs when trying to establish a VPN connection to a corporate LAN network using a PPTP client. The message reads “The remote computer did not respond.” Check your network settings and ensure the server is reachable.

8. VPN Error 734 – “The PPP Link Control Protocol Was Terminated”

Error 734 is a common issue with the message “The PPP Link Control Protocol Was Terminated.” This error may be due to incorrect connection properties. Deleting and recreating the connection is likely to resolve the issue.

9. VPN Error 789 – “The L2TP connection attempt failed”

Error 789 displays the message “The L2TP connection attempt failed because the security layer encountered a processing error.” This failure occurs during initial negotiations with the remote computer. Disabling firewalls on both ends and verifying pass-through options can resolve the issue.

10. VPN Error 798 – “A certificate could not be found”

After installing and configuring the VPN client, Error 798 may occur with the message “A certificate could not be found that can be used with this Extensible Authentication Protocol.” Check your security settings and consider reinstalling the client or installing the required certificate.

11. VPN Error 800 – “Unable to establish connection”

Error 800 happens when the VPN client’s messages are not reaching the server, leading to “Unable to establish connection.” This could be due to incorrect configuration settings on the client’s side. Verify your settings and adjust them as needed.

12. VPN Error 806 – “A connection between your computer and the VPN server”

Error 806 indicates that a router firewall is preventing some VPN protocol traffic between the client and the server. This is often caused by issues with the GRE protocol and port 1723. Ensure that the appropriate network devices are configured to allow VPN traffic.

13. VPN Error 807 – “The network connection between your computer and the VPN server was interrupted”

Error 807 is usually more related to the VPN server than the client. The error message suggests issues with network transmission, such as latency or server overloading. It may also be caused by a firewall on the client’s computer. Temporarily disabling the firewall can help troubleshoot this problem.

14. VPN Error 809 – “The network connection between your computer and the VPN server could not be established”

Error 809 often occurs when a firewall between the client and server blocks the ports that a VPN tunnel uses. This error message advises contacting your administrator or service provider for assistance or modifying the Windows registry to address NAT-related issues.

15. VPN Errors 812, 732, 734 – “The connection was prevented because of a policy configured on your RAS/VPN server”

These errors indicate that the user attempting to authenticate the connection may have insufficient access rights on Windows VPNs. Updating the user’s permissions is often the solution to these issues.

In conclusion, VPN errors can be frustrating, but they are usually manageable with some troubleshooting. Identifying the specific error code and understanding its causes and solutions can help you get back to secure and private internet access. Remember that it’s essential to maintain your VPN client and server configurations and keep them up to date to prevent these errors in the first place.

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