Software⏱️ 3 min read📅 2026-06-19

How to Fix: openvpn 2.2.1 error from SSL_CTX_load_verify_locations

OpenVPN error SSL_CTX_load_verify_locations on Linux Ubuntu 12.04.

Quick Answer: Check the file path and permissions of mycorp-ca.crt, ensure it is correctly specified in the OpenVPN configuration.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

The error 'Cannot load CA certificate file mycorp-ca.crt path (null) (SSL_CTX_load_verify_locations)' occurs when OpenVPN is unable to find or read the specified Certificate Authority (CA) file, in this case, 'mycorp-ca.crt'. This issue affects users who are trying to connect to a VPN server using an OpenVPN client configuration on Linux.

This error can be frustrating as it prevents the user from establishing a connection to the VPN server. To resolve this issue, we need to identify and correct the problem with the CA file.

🛑 Root Causes of the Error

  • The primary reason for this error is that the CA file 'mycorp-ca.crt' is not located in the expected path specified in the OpenVPN configuration. The error message indicates that the CAfile and CApath are NULL, meaning they are empty or undefined. This can happen if the file path is incorrect, the file does not exist, or it is not readable by the user running the OpenVPN service.
  • Alternatively, another reason for this error could be a permissions issue with the CA file. If the file is not readable by the user running the OpenVPN service, the system will fail to load it.

✅ Best Solutions to Fix It

Verify the file path and permissions

  1. Step 1: Check the file path of 'mycorp-ca.crt' in the OpenVPN configuration to ensure it matches the actual location of the file.
  2. Step 2: Verify that the CA file is readable by the user running the OpenVPN service. You can do this by checking the file permissions and ensuring they are set correctly (e.g., 644).
  3. Step 3: If the file path or permissions are correct, try renaming the CA file to a temporary location and then try loading it again in the OpenVPN configuration.

Specify the full path of the CA file

  1. Step 1: In the OpenVPN configuration, specify the full path of the CA file instead of just the filename. For example, instead of 'mycorp-ca.crt', use '/path/to/mycorp-ca.crt'.
  2. Step 2: This ensures that OpenVPN knows exactly where to find the CA file and avoids any potential issues with file paths.

✨ Wrapping Up

To resolve the error 'Cannot load CA certificate file mycorp-ca.crt path (null) (SSL_CTX_load_verify_locations)', verify that the file path of the CA file is correct, ensure the file is readable by the user running the OpenVPN service, and consider specifying the full path of the CA file in the OpenVPN configuration.

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