Software⏱️ 3 min read📅 2026-06-11

How to Fix Error 812 Error – Error 812 from Windows VPN

Error 812 occurs when authentication method mismatch between VPN server and client profile.

Quick Answer: Check the authentication methods used by the server and client profiles for a match.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

Error 812 is an authentication failure message that occurs when attempting to connect to a VPN server using Windows 8 on both the client and server sides. This error typically affects users who have followed instructions from reputable sources, such as HowToGeek, to set up a home computer-based VPN server without installing any additional software.

This issue can be frustrating because it prevents users from accessing remote networks or resources that require VPN connectivity. In this troubleshooting guide, we will explore the root causes of Error 812 and provide step-by-step solutions for resolving this issue.

💡 Why You Are Getting This Error

  • The primary reason for Error 812 is a mismatch between the authentication method used by the RAS/VPN server and the authentication method configured in the client's connection profile. This discrepancy can occur when using different versions of Windows or when the VPN server configuration does not match the client's expected settings.
  • Another possible cause of Error 812 is an incorrect or incomplete configuration on either the server or client side, which may lead to a mismatch between the authentication methods used by both parties.

🚀 How to Resolve This Issue

Configuring Matching Authentication Methods

  1. Step 1: Step 1: Review and update the VPN server configuration to ensure it matches the expected settings for Windows 8 clients. This may involve checking the authentication method, such as L2TP/IPSec or PPTP, and verifying that the server is configured to use the same method.
  2. Step 2: Step 2: Check the client's connection profile to ensure it is set up with the correct authentication method and configuration settings. If necessary, update these settings to match the VPN server configuration.
  3. Step 3: Step 3: Test the VPN connection again using the updated configurations on both the server and client sides to verify that Error 812 is resolved.

Configuring Windows Firewall and Network Policies

  1. Step 1: Step 1: Ensure that Windows Firewall is configured to allow outgoing traffic on the necessary ports for VPN connections. This may involve adding rules or exceptions in the Firewall settings.
  2. Step 2: Step 2: Review and update any network policies or group policy settings that may be affecting VPN connectivity. Verify that these policies are not blocking or restricting VPN traffic.

🎯 Final Words

Error 812 can be resolved by configuring matching authentication methods on both the server and client sides, as well as ensuring that Windows Firewall and network policies do not interfere with VPN connectivity. By following these steps, users should be able to establish a successful VPN connection using their home computer.

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