How do I fix: 🛑 Root Causes of the Error?

The primary reason for this error is that the CA message digest is too weak, which means it cannot provide sufficient security for the SSL connection. This can happen if the system administrator has not updated the OpenSSL configuration or if the certificate authority used is outdated.An alternative

How do I fix: Update certificate authority?

Step 1: Update the system's CA message digest to a stronger value. This can be done by modifying the `openssl.cnf` file or using a tool like OpenSSL to generate a new CA message digest.Step 2: Use a more secure certificate authority, such as a trusted root certificate, to provide a stronger SSL conn

Software⏱️ 3 min read📅 2026-06-11

How to Fix: OpenSSL: error:0A00018E:SSL routines::ca md too weak

Q: How do I fix: 🔧 Proven Troubleshooting Steps Update OpenSSL to a compatible version?

Step 1: Update the system's OpenSSL package to a compatible version. This can be done using the following command: `sudo apt-get update && sudo apt-get install openssl`.Step 2: Check if there are any newer versions of OpenSSL available and update them accordingly.Step 3: Verify that the updated Open

OpenSSL error:0A00018E:SSL routines::ca md too weak, fix for Linux Mint 21 OpenVPN connection.

Quick Answer: Update OpenSSL to a newer version or use the --data-ciphers-fallback option to enable BF-CBC cipher.

📋 Table of Contents

🛑 Root Causes of the Error
🔧 Proven Troubleshooting Steps
🎯 Final Words

The error 'OpenSSL: error:0A00018E:SSL routines::ca md too weak' occurs when OpenVPN is unable to establish an SSL connection due to a weak certificate authority (CA) message digest. This error affects users who are trying to connect to remote servers using OpenVPN.

This issue can be frustrating as it prevents the user from establishing a secure connection, and it requires additional steps to resolve. However, by following the troubleshooting guide below, users should be able to identify and fix the problem.

🛑 Root Causes of the Error

The primary reason for this error is that the CA message digest is too weak, which means it cannot provide sufficient security for the SSL connection. This can happen if the system administrator has not updated the OpenSSL configuration or if the certificate authority used is outdated.
An alternative reason for this error could be that the OpenSSL version being used is older than the recommended version, which may also cause compatibility issues.

🔧 Proven Troubleshooting Steps

Update OpenSSL to a compatible version

Step 1: Update the system's OpenSSL package to a compatible version. This can be done using the following command: `sudo apt-get update && sudo apt-get install openssl`.
Step 2: Check if there are any newer versions of OpenSSL available and update them accordingly.
Step 3: Verify that the updated OpenSSL version is compatible with OpenVPN 2.5.5.

Update certificate authority

Step 1: Update the system's CA message digest to a stronger value. This can be done by modifying the `openssl.cnf` file or using a tool like OpenSSL to generate a new CA message digest.
Step 2: Use a more secure certificate authority, such as a trusted root certificate, to provide a stronger SSL connection.

🎯 Final Words

To resolve the 'OpenSSL: error:0A00018E:SSL routines::ca md too weak' error, users need to update their OpenSSL version and/or certificate authority. By following these steps, users should be able to establish a secure connection using OpenVPN.

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