Software⏱️ 4 min read📅 2026-06-15

How to Fix: Stunnel PSK Error

Technical issue analysis and metadata for Stunnel PSK Error

Quick Answer: The issue is caused by the incorrect cipher configuration in the stunnel server configuration. Update the ciphers to include PSK, and ensure that the CAfile matches the certificate used in the client configuration.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

The 'Stunnel PSK Error' is an issue that affects users who are trying to connect to HTTPS-enabled websites using Squid and Stunnel as their SSL proxy server. This error occurs when the client-side browser fails to establish a secure connection with the server, resulting in a 'Connection Reset' error message.

This error can be frustrating for users who rely on the proxy server to access the internet securely. In this guide, we will walk you through the steps to troubleshoot and fix the Stunnel PSK Error.

⚠️ Common Causes

  • The primary cause of the Stunnel PSK Error is a mismatch between the client-side configuration and the server-side configuration. Specifically, the client-side configuration has an incorrect 'PSKsecrets' parameter, which is not set to match the server-side configuration. This causes the client-side browser to fail to authenticate with the server using Pre-Shared Key (PSK) authentication.
  • Another possible cause of the Stunnel PSK Error is a problem with the CAfile or the certificate chain on the server-side. If the CAfile or the certificate chain is not properly configured, it can prevent the client-side browser from authenticating with the server using PSK authentication.

✅ Best Solutions to Fix It

Verify and correct the 'PSKsecrets' parameter in both Stunnel and Squid configurations

  1. Step 1: Open the Stunnel configuration file (stunnel.conf) and verify that the 'PSKsecrets' parameter is set to match the server-side configuration. If necessary, update the 'PSKsecrets' parameter to point to the correct location of the PSK secrets file.
  2. Step 2: Restart the Stunnel service to apply the changes.
  3. Step 3: Open the Squid configuration file (squid.conf) and verify that the 'client' parameter is set to 'yes' and the 'PSKsecrets' parameter matches the one in the Stunnel configuration. If necessary, update the 'PSKsecrets' parameter to point to the correct location of the PSK secrets file.
  4. Step 4: Restart the Squid service to apply the changes.

Verify and correct the CAfile or certificate chain on the server-side

  1. Step 1: Check the CAfile and certificate chain on the server-side to ensure that they are properly configured for PSK authentication. If necessary, update the CAfile or certificate chain to include the correct certificates.
  2. Step 2: Restart the Stunnel service to apply the changes.

✨ Wrapping Up

By following these steps, you should be able to troubleshoot and fix the Stunnel PSK Error. Remember to carefully verify and correct both the 'PSKsecrets' parameter in Stunnel and Squid configurations, as well as the CAfile or certificate chain on the server-side. If you are still experiencing issues after completing these steps, please seek further assistance from a qualified IT professional.

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