Software⏱️ 3 min read📅 2026-06-04

How to Fix: Curl: Fix CURL (51) SSL error: no alternative certificate subject name matches

Learn how to fix: Curl: Fix CURL (51) SSL error: no alternative certificate subject name matches.

Quick Answer: Try checking your system settings or restarting.

📋 Table of Contents

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

The 'CURL (51) SSL error: no alternative certificate subject name matches' issue occurs when the server's SSL certificate is not properly configured or does not match the expected subject name. This error affects users who attempt to access APIs or websites using the curl command on Windows, particularly those without experience in SSL configurations.

This frustrating error can be resolved by following the steps outlined below. The primary fix method involves updating the system's certificate store and verifying the server's SSL configuration.

💡 Why You Are Getting This Error

  • The first main reason for this error is that the server's SSL certificate does not match the expected subject name. This can occur due to a misconfiguration of the server's certificate or an incorrect installation of the SSL certificate.
  • An alternative reason for this error could be that the system's certificate store is not properly configured, leading to an inability to verify the server's identity.

🚀 How to Resolve This Issue

Updating System Certificate Store

  1. Step 1: Step 1: Open the Command Prompt as Administrator. Right-click on Start and select 'Command Prompt (Admin)'.
  2. Step 2: Step 2: Navigate to the certificate store location using the command 'certlm', which will list all installed certificates.
  3. Step 3: Step 3: Locate the server's SSL certificate in the list of installed certificates and select it for removal. If prompted, confirm that you want to remove the certificate.
  4. Step 4: Step 4: Install a new SSL certificate from the server provider or obtain one from an alternative source.

Verifying Server's SSL Configuration

  1. Step 1: Step 1: Contact the server administrator to verify that the server's SSL configuration is correct and up-to-date.
  2. Step 2: Step 2: Review the server's certificate store to ensure that it matches the expected subject name.

🎯 Final Words

By following these steps, users should be able to resolve the 'CURL (51) SSL error: no alternative certificate subject name matches' issue. Remember to always verify the server's SSL configuration and update the system's certificate store as necessary to ensure secure communication between your system and the server.

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