VPN Error 812: Understanding and Fixing the Issue

Virtual Private Networks (VPNs) are an essential tool for privacy, security, and unrestricted access to global content. However, like any technology, they’re not immune to occasional hiccups. One common issue many users encounter is VPN Error 812. If you’ve come across this error, don’t worry—you’re not alone. In this blog, I’ll dive into what VPN Error 812 means, the reasons behind it, and how you can troubleshoot and fix it step by step. Let’s ensure you’re back online in no time!

Virtual Private Networks (VPNs) are an essential tool for privacy, security, and unrestricted access to global content. However, like any technology, they’re not immune to occasional hiccups. One common issue many users encounter is VPN Error 812. If you’ve come across this error, don’t worry—you’re not alone. In this blog, I’ll dive into what VPN Error 812 means, the reasons behind it, and how you can troubleshoot and fix it step by step. Let’s ensure you’re back online in no time!

What is VPN Error 812?

VPN Error 812 is a connectivity error that typically occurs when attempting to establish a VPN connection using the Remote Access Server (RAS) on a Windows-based system. It’s specific to the Point-to-Point Tunneling Protocol (PPTP) or Layer 2 Tunneling Protocol (L2TP) with IPsec.

The full error message usually reads something like this:

“The connection was prevented because of a policy configured on your RAS/VPN server. Specifically, the authentication method used by the server to verify your username and password may not match the authentication protocol configured in your connection profile.”

In simpler terms, this error occurs due to a mismatch in authentication protocols or policies configured on the VPN server or client side.

Common Causes of VPN Error 812

Before diving into the fixes, it’s essential to understand the common causes of this error:

1. Authentication Mismatch: The VPN server and the client use different authentication protocols.
2. Network Policy Configuration: A misconfiguration in the server’s Network Policy Server (NPS) settings can prevent connections.
3. IP Address Allocation Issues: The VPN server might fail to assign an IP address to the client.
4. Outdated Windows Updates: Missing critical updates can cause incompatibility issues.
5. Firewall or Antivirus Interference: Security software might block the VPN connection.
6. Group Policy Restrictions: In corporate environments, group policies may impose restrictions that lead to this error.

How to Fix VPN Error 812

Now that we understand the causes, let’s explore how to fix VPN Error 812. Follow these steps in order:

1. Check VPN Authentication Protocols

The first step is to ensure that the VPN client and server are using compatible authentication protocols:

• Open your VPN client settings.
• Check the authentication protocol (e.g., MS-CHAP v2).
• Verify with your network administrator or VPN provider what protocol the server uses.
• Match the settings on the client side.

2. Verify Network Policy Server (NPS) Settings

If you’re an administrator, check the VPN server’s Network Policy Server settings:

• Open the NPS management console.
• Navigate to “Policies > Network Policies.”
• Review the policy assigned to VPN connections.
• Ensure that the policy allows the required authentication protocols and conditions.

3. Ensure Proper IP Address Allocation

VPN Error 812 can occur if the server fails to allocate an IP address to the client. Here’s how to check:

• Open the VPN server settings.
• Verify the DHCP settings or static IP pool configuration.
• Ensure there are enough available IP addresses for new connections.

4. Update Windows

Outdated Windows systems can cause compatibility issues. To ensure your system is up to date:

• Open Settings > Update & Security > Windows Update.
• Click “Check for Updates” and install any pending updates.
• Restart your computer and try reconnecting to the VPN.

5. Disable Firewall and Antivirus Temporarily

Sometimes, security software can block VPN connections. To test:

• Disable your firewall and antivirus temporarily.
• Attempt to connect to the VPN.
• If successful, configure your firewall or antivirus to allow VPN traffic.

6. Review Group Policies (For Corporate Networks)

For users in a corporate environment, Group Policies may restrict VPN access. Contact your IT administrator to:

• Verify if the Group Policy Object (GPO) allows VPN connections.
• Ensure the policies match the VPN server’s configuration.

7. Test with Another VPN Protocol

If possible, switch to another VPN protocol like OpenVPN or IKEv2. These protocols are more modern and reliable compared to PPTP and L2TP/IPsec.

8. Reinstall VPN Client Software

Corrupt VPN client software can also trigger Error 812. Here’s how to reinstall:

• Uninstall your VPN client via Settings > Apps.
• Download the latest version of the VPN client from the official website.
• Reinstall and configure the VPN connection.

9. Contact Your VPN Provider

If none of the above steps resolve the issue, reach out to your VPN provider’s support team. Provide them with details about the error and steps you’ve already tried. They can often diagnose server-side issues or provide specific guidance.

FAQs

Conclusion

VPN Error 812 might seem daunting, but with a clear understanding of its causes and solutions, you can fix it quickly. Whether it’s an authentication mismatch, IP allocation issue, or server policy misconfiguration, the steps outlined above should guide you to a resolution.

If you found this guide helpful or have additional questions, feel free to email us. Happy browsing, securely and without interruptions!