Software⏱️ 4 min read📅 2026-06-15

How to Fix Error code2 Error – How to solve Error code2 in softether (VPN gate)?

Error code 2 occurs when connecting to a VPN server using TCP mode, but not UDP mode. Solution: try updating the SoftEther VPN client or VPN gate plugin.

Quick Answer: Try updating the SoftEther VPN client or VPN gate plugin.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

Error code 2 in SoftEther VPN client and VPN gate plugin is encountered when attempting to connect in TCP mode, resulting in a protocol error with an error message indicating that the error occurred on the destination server. This issue affects users who have installed the latest version of SoftEther VPN client and VPN gate plugin on Windows 10, but not all users experience this problem. The frustration lies in being unable to establish a connection using TCP mode when UDP mode is accessible.

This guide aims to resolve the Error code 2 issue in SoftEther VPN client and VPN gate plugin, providing two alternative methods for fixing the problem.

⚠️ Common Causes

  • The primary cause of Error code 2 in SoftEther VPN client and VPN gate plugin is related to the configuration or settings used during the connection process. Specifically, it may be due to incorrect or incompatible settings on the VPN gate server-side or the client-side. This could also be caused by a misconfiguration of the TCP protocol options.
  • An alternative reason for Error code 2 could be due to issues with the IP address or port number used in the connection setup. Sometimes, using an invalid IP address or incorrect port number can lead to this error.

🛠️ Step-by-Step Verified Fixes

Method 1: Checking and adjusting VPN gate server settings

  1. Step 1: Step 1: Check the VPN gate server configuration for any specific TCP protocol options that may need to be adjusted. Ensure that the correct port number is used and that there are no restrictions on incoming or outgoing TCP connections.
  2. Step 2: Step 2: Verify that the VPN gate server has the necessary configuration settings to support TCP mode. Some servers might have default settings set to only allow UDP connections, so it's essential to check these settings before proceeding.
  3. Step 3: Step 3: If necessary, adjust the server settings according to the SoftEther VPN documentation or consult with the VPN provider for assistance.

Method 2: Disabling TCP checksum validation on the client-side

  1. Step 1: Step 1: Open the SoftEther VPN client and navigate to the 'Settings' menu.
  2. Step 2: Step 2: In the settings window, select the 'TCP' tab and look for options related to TCP checksum validation. Ensure that this option is disabled or set to a suitable value.
  3. Step 3: Step 3: Save the changes and attempt to reconnect in TCP mode.

💡 Conclusion

By following these steps, users should be able to resolve Error code 2 in SoftEther VPN client and VPN gate plugin and successfully connect using TCP mode. If none of these methods work, it may be necessary to consult with the VPN provider for further assistance or contact their support team for additional guidance.

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